riscv64 fails to build Python/perf_jit_trampoline.c: Unsupported target architecture

build: https://buildbot.python.org/all/#/builders/1379/builds/625

gcc -c -fno-strict-overflow -fstack-protector-strong -Wtrampolines -Wsign-compare -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/perf_trampoline.o Python/perf_trampoline.c
gcc -c -fno-strict-overflow -fstack-protector-strong -Wtrampolines -Wsign-compare -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/perf_jit_trampoline.o Python/perf_jit_trampoline.c
Python/perf_jit_trampoline.c:375:6: error: #error "Unsupported target architecture"
  375 | #    error "Unsupported target architecture"
      |      ^~~~~

• Latest successful build: https://buildbot.python.org/all/#/builders/1379/builds/551 -- commit 69b3e8ea569faabccd74036e3d0e5ec7c0c62a20
• First failing build: https://buildbot.python.org/all/#/builders/1379/builds/553 -- commit 56657f6be26c11e4b7045515fd3bd15bbda3c338

cc @pablogsal

Linked PRs

• gh-121328
• gh-121336
• gh-121387

從 Python/perf_jit_trampoline.c 的第 375 行附近開始，根據連結的 buildbot 失敗重現 riscv64 建置。比較最近一次成功的提交和第一次失敗的提交，然後檢視 gh-121328、gh-121336 和 gh-121387；完成的標準是 riscv64 建置在沒有 unsupported-target 錯誤的情況下完成。