[clang] [clang][bytecode] Handle __builtin_memcmp (PR #119544)

[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 1232: static assertion failed due to requirement '__builtin_memcmp(ku00feff, ks00fe00, 2) == 0'
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1235: static assertion failed due to requirement '__builtin_memcmp(ks00feff, ku00fe00, 2) == 0'
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1238: static assertion failed due to requirement '__builtin_memcmp(ks00fe00, ks00feff, 2) == 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 1232: expression evaluates to '1 == 0'
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1235: expression evaluates to '1 == 0'
  File /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/clang/test/AST/ByteCode/builtin-functions.cpp Line 1238: expression evaluates to '-1 == 0'
8 errors generated.
```

https://github.com/llvm/llvm-project/pull/119544