[clang] [serialization] no transitive decl change (PR #92083)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

I'll close it as there are some crashes.

---

The crash log:

```
********** TEST 'Clang :: Modules/redecl-ivars.m' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: rm -rf /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp
+ rm -rf /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp
RUN: at line 3: split-file /b/sanitizer-x86_64-linux-fast/build/llvm-project/clang/test/Modules/redecl-ivars.m /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp
+ split-file /b/sanitizer-x86_64-linux-fast/build/llvm-project/clang/test/Modules/redecl-ivars.m /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp
RUN: at line 4: /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/clang -cc1 -internal-isystem /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/lib/clang/19/include -nostdsysteminc -fsyntax-only -fobjc-runtime=macosx-10.9 -verify -I/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/include /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/test-mismatch-in-extension.m
+ /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/clang -cc1 -internal-isystem /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/lib/clang/19/include -nostdsysteminc -fsyntax-only -fobjc-runtime=macosx-10.9 -verify -I/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/include /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/test-mismatch-in-extension.m
RUN: at line 5: /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/clang -cc1 -internal-isystem /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/lib/clang/19/include -nostdsysteminc -fsyntax-only -fobjc-runtime=macosx-10.9 -verify -I/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/include /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/test-mismatch-in-extension.m             -fmodules -fimplicit-module-maps -fmodules-cache-path=/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/modules.cache
+ /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/bin/clang -cc1 -internal-isystem /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/lib/clang/19/include -nostdsysteminc -fsyntax-only -fobjc-runtime=macosx-10.9 -verify -I/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/include /b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/test-mismatch-in-extension.m -fmodules -fimplicit-module-maps -fmodules-cache-path=/b/sanitizer-x86_64-linux-fast/build/llvm_build_asan_ubsan/tools/clang/test/Modules/Output/redecl-ivars.m.tmp/modules.cache
/b/sanitizer-x86_64-linux-fast/build/libcxx_build_asan_ubsan/include/c++/v1/__algorithm/lower_bound.h:39:53: runtime error: reference binding to misaligned address 0x529000045c44 for type 'const clang::serialization::ObjCCategoriesInfo', which requires 8 byte alignment
0x529000045c44: note: pointer points here
  00 00 00 00 02 00 00 00  01 00 00 00 02 00 00 00  00 00 00 00 c3 0d 88 60  0a a8 81 10 03 20 08 00
              ^ 
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /b/sanitizer-x86_64-linux-fast/build/libcxx_build_asan_ubsan/include/c++/v1/__algorithm/lower_bound.h:39:53 

--

It looks like misaligned access too. I'll try to fix it.

(It is somewhat hurting that we can't find them on the trunk.)
```

https://github.com/llvm/llvm-project/pull/92083