[clang] [clang][bytecode] Handle __builtin_bcmp (PR #119678)

[Aaron Puchert via cfe-commits]

aaronpuchert wrote:

Check out https://lab.llvm.org/buildbot/#/builders/13/builds/4041:
```
RUN: at line 1: /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/clang -cc1 -internal-isystem /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/lib/clang/20/include -nostdsysteminc -Wno-string-plus-int -fexperimental-new-constant-interpreter /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp -verify=expected,both
+ /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/clang -cc1 -internal-isystem /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/lib/clang/20/include -nostdsysteminc -Wno-string-plus-int -fexperimental-new-constant-interpreter /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp -verify=expected,both
error: 'both-error' diagnostics seen but not expected: 
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1272: static assertion failed due to requirement '__builtin_bcmp("abab\000banana", "abab\000canada", 5) == 0'
error: 'both-note' diagnostics seen but not expected: 
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1272: expression evaluates to '1 == 0'
8 errors generated.
```

https://github.com/llvm/llvm-project/pull/119678