[clang] assertion failure at clang::FunctionDecl::setDefaultedOrDeletedInfo in clang/lib/AST/Decl.cpp

https://godbolt.org/z/bW7ofv9W5

The following code:

```cpp
namespace std {
struct strong_ordering {
int n;
static const strong_ordering less, equal, greater;
};
constexpr strong_ordering strong_ordering::less{-1}, strong_ordering::equal{0}, strong_ordering::greater{1};
struct reverse_compare {
constexpr explicit reverse_compare(std::strong_ordering o) : n(-o.n) {}
}
struct B {
friend reverse_compare operator<=>(const B&, const B&) = default;
static_assert(B{1, 2, 3, 4, 5} >= B{1, 2, 0, 40, 5});
}
}
```

Resulted in this output:
```
clang++: /home/fuzz/WorkSpace/fusion-fuzz/projects/clang/llvm-project/clang/lib/AST/Decl.cpp:3141: void clang::FunctionDecl::setDefaultedOrDeletedInfo(clang::FunctionDecl::DefaultedOrDeletedFunctionInfo*): Assertion `!Body && "can't replace function body with defaulted function info"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and dumped files.
Stack dump:
0. Program arguments: /home/fuzz/WorkSpace/fusion-fuzz/projects/clang/llvm-clang-install/bin/clang++ -S -o /dev/null -O3 -std=c++20 /tmp/test.cpp
1. parser at end of file
2. /tmp/test.cpp:1:1: parsing namespace 'std'
3. /tmp/test.cpp:10:1: parsing struct/union/class body 'std::B'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0 clang++ 0x0000563ab780e0f9 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 121
1 clang++ 0x0000563ab780adcc llvm::sys::RunSignalHandlers() + 76
2 clang++ 0x0000563ab780b678 llvm::sys::CleanupOnSignal(unsigned long) + 216
3 clang++ 0x0000563ab774df88
4 libc.so.6 0x00007f2335d46520
5 libc.so.6 0x00007f2335d9a9fc pthread_kill + 300
6 libc.so.6 0x00007f2335d46476 raise + 22
7 libc.so.6 0x00007f2335d2c7f3 abort + 211
8 libc.so.6 0x00007f2335d2c71b
9 libc.so.6 0x00007f2335d3de96
10 clang++ 0x0000563abb2070c8 clang::FunctionDecl::setDefaultedOrDeletedInfo(clang::FunctionDecl::DefaultedOrDeletedFunctionInfo*) + 56
11 clang++ 0x0000563aba453e43 clang::Sema::CheckExplicitlyDefaultedComparison(clang::Scope*, clang::FunctionDecl*, clang::Sema::DefaultedComparisonKind) + 307
12 clang++ 0x0000563aba4731e3 clang::Sema::CheckExplicitlyDefaultedFunction(clang::Scope*, clang::FunctionDecl*) + 643
13 clang++ 0x0000563aba47c36d clang::Sema::CheckCompletedCXXClass(clang::Scope*, clang::CXXRecordDecl*) + 2269
14 clang++ 0x0000563aba47de33 clang::Sema::ActOnFinishCXXMemberSpecification(clang::Scope*, clang::SourceLocation, clang::Decl*, clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributesView const&) + 355
15 clang++ 0x0000563aba0139f3 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) + 1395
16 clang++ 0x0000563aba0164ff clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) + 8191
17 clang++ 0x0000563ab9fe5732 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::LateParsedAttrList*, clang::ImplicitTypenameContext) + 2994
18 clang++ 0x0000563ab9fa0e88 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) + 200
19 clang++ 0x0000563ab9fa192f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) + 959
20 clang++ 0x0000563ab9fad7a1 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) + 977
21 clang++ 0x0000563aba00b85b clang::Parser::ParseInnerNamespace(llvm::SmallVector const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) + 507
22 clang++ 0x0000563aba00c604 clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) + 3188
23 clang++ 0x0000563ab9ff4eab clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) + 827
24 clang++ 0x0000563ab9fad8d8 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) + 1288
25 clang++ 0x0000563ab9fae7df clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&, clang::Sema::ModuleImportState&) + 575
26 clang++ 0x0000563ab9faebf4 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&, clang::Sema::ModuleImportState&) + 68
27 clang++ 0x0000563ab9f8b6db clang::ParseAST(clang::Sema&, bool, bool) + 539
28 clang++ 0x0000563ab8504071 clang::FrontendAction::Execute() + 65
29 clang++ 0x0000563ab848dc65 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1589
30 clang++ 0x0000563ab85dfea3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 467
31 clang++ 0x0000563ab61e2c96 cc1_main(llvm::ArrayRef, char const*, void*) + 7046
32 clang++ 0x0000563ab61d8a2a
33 clang++ 0x0000563ab61d8bbf
34 clang++ 0x0000563ab821535d
35 clang++ 0x0000563ab774e3a0 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref) + 160
36 clang++ 0x0000563ab82161b3
37 clang++ 0x0000563ab81cb987 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const + 167
38 clang++ 0x0000563ab81d01e0 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl>&, bool) const + 304
39 clang++ 0x0000563ab81dde44 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl>&) + 404
40 clang++ 0x0000563ab61de2d3 clang_main(int, char**, llvm::ToolContext const&) + 7267
41 clang++ 0x0000563ab61307a1 main + 113
42 libc.so.6 0x00007f2335d2dd90
43 libc.so.6 0x00007f2335d2de40 __libc_start_main + 128
44 clang++ 0x0000563ab61d8055 _start + 37
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 24.0.0git (https://github.com/llvm/llvm-project.git aefba88f46a6e55645c848f58f6ba56944d5ae62)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/fuzz/WorkSpace/fusion-fuzz/projects/clang/llvm-clang-install/bin
Build config: +assertions
clang++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING CRASH REPRODUCER FILES TO THE BUG REPORT:
clang++: note: diagnostic msg: /tmp/test-646ae9.cpp
clang++: note: diagnostic msg: /tmp/test-646ae9.sh
clang++: note: diagnostic msg:

********************
Aborted (core dumped)

```

To reproduce:
```
/home/fuzz/WorkSpace/fusion-fuzz/projects/clang/llvm-clang-install/bin/clang++ -std=c++20 ./test.cpp
```

Compiler version:
```
clang version 24.0.0git (https://github.com/llvm/llvm-project.git aefba88f46a6e55645c848f58f6ba56944d5ae62)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/fuzz/WorkSpace/fusion-fuzz/projects/clang/llvm-clang-install/bin
Build config: +assertions
```

*This bug was found by [fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)*