clang-21 crashes when trying to compile

clang crashes when trying to compile my code.
I've attached the preprocessed source files.

Shell command:
```
clang-21 -std=c23 -Wall -Wextra -Wformat=0 -Wno-unused-parameter -Wno-unused-function -fsanitize=address -g ./lexer.c ./irparser.c ./globals.c ./main.c ./value.c -o tachyon
```

Stack dump:
```
0. Program arguments: /usr/lib/llvm-21/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -dumpdir tachyon- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name irparser.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debug-info-kind=constructor -dwarf-version=5 -debugger-tuning=gdb -fdebug-compilation-dir=/home/raketil/Documents/Programming/tachyon-c -fcoverage-compilation-dir=/home/raketil/Documents/Programming/tachyon-c -resource-dir /usr/lib/llvm-21/lib/clang/21 -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wall -Wextra -Wformat=0 -Wno-unused-parameter -Wno-unused-function -std=c23 -ferror-limit 19 -fmessage-length=170 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -fsanitize=address -fsanitize-system-ignorelist=/usr/lib/llvm-21/lib/clang/21/share/asan_ignorelist.txt -fno-sanitize-memory-param-retval -fsanitize-address-use-after-scope -fsanitize-address-globals-dead-stripping -fno-assume-sane-operator-new -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/irparser-195cd9.o -x c ./irparser.c
1. parser at end of file
2. ./irparser.c:858:4: LLVM IR generation of declaration 'parse'
3. ./irparser.c:858:4: Generating code for declaration 'parse'
#0 0x00007fc4fd3f2c9a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x45f2c9a)
#1 0x00007fc4fd3f0487 llvm::sys::RunSignalHandlers() (/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x45f0487)
#2 0x00007fc4fd3f3a64 (/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x45f3a64)
#3 0x00007fc4f8849df0 (/lib/x86_64-linux-gnu/libc.so.6+0x3fdf0)
#4 0x00007fc502a71d40 clang::ASTContext::getTypeInfoImpl(clang::Type const*) const (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x1671d40)
#5 0x00007fc502a72c92 clang::ASTContext::getTypeInfoInChars(clang::Type const*) const (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x1672c92)
#6 0x00007fc502a73d2d clang::ASTContext::getTypeSizeInChars(clang::QualType) const (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x1673d2d)
#7 0x00007fc503c26aff clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2826aff)
#8 0x00007fc503be86e9 clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x27e86e9)
#9 0x00007fc503be5ca1 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x27e5ca1)
#10 0x00007fc503bdfd8b clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x27dfd8b)
#11 0x00007fc503bdf9e2 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&, bool) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x27df9e2)
#12 0x00007fc503d8fad0 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x298fad0)
#13 0x00007fc503d8f077 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x298f077)
#14 0x00007fc503d9aafc clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x299aafc)
#15 0x00007fc503dfc84e clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x29fc84e)
#16 0x00007fc503e1f6b8 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2a1f6b8)
#17 0x00007fc503e18c9f clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2a18c9f)
#18 0x00007fc503e1cb65 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2a1cb65)
#19 0x00007fc503e178b5 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2a178b5)
#20 0x00007fc503ec072c (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x2ac072c)
#21 0x00007fc503dec60d clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x29ec60d)
#22 0x00007fc50298909a clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x158909a)
#23 0x00007fc50459a26f clang::FrontendAction::Execute() (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x319a26f)
#24 0x00007fc50450bf74 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x310bf74)
#25 0x00007fc504622cce clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-21/bin/../lib/libclang-cpp.so.21.1+0x3222cce)
#26 0x0000559a70bde88d cc1_main(llvm::ArrayRef, char const*, void*) (/usr/lib/llvm-21/bin/clang+0x1388d)
#27 0x0000559a70bdb435 (/usr/lib/llvm-21/bin/clang+0x10435)
#28 0x0000559a70bda7c4 clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-21/bin/clang+0xf7c4)
#29 0x0000559a70be995a main (/usr/lib/llvm-21/bin/clang+0x1e95a)
#30 0x00007fc4f8833ca8 (/lib/x86_64-linux-gnu/libc.so.6+0x29ca8)
#31 0x00007fc4f8833d65 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29d65)
#32 0x0000559a70bd9101 _start (/usr/lib/llvm-21/bin/clang+0xe101)
```

Diagnostic message:
```
Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-21/bin
clang-21: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-21: note: diagnostic msg: /tmp/lexer-d5038d.c
clang-21: note: diagnostic msg: /tmp/irparser-b1b69e.c
clang-21: note: diagnostic msg: /tmp/globals-9f618e.c
clang-21: note: diagnostic msg: /tmp/main-4158b4.c
clang-21: note: diagnostic msg: /tmp/value-903192.c
clang-21: note: diagnostic msg: /tmp/lexer-d5038d.sh
clang-21: note: diagnostic msg:

********************
```

[lexer-d5038d.sh](https://github.com/user-attachments/files/24423517/lexer-d5038d.sh)
[value-903192.c](https://github.com/user-attachments/files/24423519/value-903192.c)
[main-4158b4.c](https://github.com/user-attachments/files/24423518/main-4158b4.c)
[lexer-d5038d.c](https://github.com/user-attachments/files/24423520/lexer-d5038d.c)
[irparser-b1b69e.c](https://github.com/user-attachments/files/24423521/irparser-b1b69e.c)
[globals-9f618e.c](https://github.com/user-attachments/files/24423522/globals-9f618e.c)

Reproduce the crash with the posted clang-21 command and the attached preprocessed sources, starting with irparser-b1b69e.c at line 858 in parse, where the stack dump enters LLVM IR generation. Trace the failing compiler path and confirm that clang no longer crashes when compiling the supplied inputs.

Written by the indexing model from the issue text.