[clang] [StaticAnalyzer] Fix tryExpandAsInteger's failures on PCH macros (PR #142722)

[Ziqing Luo via cfe-commits]

ziqingluo-90 wrote:

Thanks for merging it for me.  Buildbots failures seems irrelevant:
```
TEST 'lldb-api :: tools/lldb-dap/launch/TestDAP_launch.py' FAILED
or
FAILED: libc/src/math/amdgpu/CMakeFiles/libc.src.math.amdgpu.acosh.dir/acosh.cpp.o
```

https://github.com/llvm/llvm-project/pull/142722