[clang] [Clang] Implement diagnostics for why `std::is_standard_layout` is false (PR #144161)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

Precommit CI found relevant failures:
```
FAILED: tools/clang/include/clang/Basic/DiagnosticAnalysisEnums.inc 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/include/clang/Basic/DiagnosticAnalysisEnums.inc
 
cd 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/include/clang/Basic
 && 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang-tblgen 
-gen-clang-diags-enums -clang-component=Analysis 
-I/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include/clang/Basic
 -I/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include 
-I/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/include
 -I/home/gha/actions-runner/_work/llvm-project/llvm-project/build/include 
-I/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/include 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include/clang/Basic/Diagnostic.td
 --write-if-changed -o DiagnosticAnalysisEnums.inc -d 
DiagnosticAnalysisEnums.inc.d && /usr/bin/cmake -E cmake_transform_depfile 
Ninja gccdepfile /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include/clang/Basic
 /home/gha/actions-runner/_work/llvm-project/llvm-project/build 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/include/clang/Basic
 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/clang/include/clang/Basic/DiagnosticAnalysisEnums.inc.d
 
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/CMakeFiles/d/cf0b499e292100c840f13d8fd4f9c37039043cd2a7ced2cb25ac66d1e34104e6.d
Included from 
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include/clang/Basic/Diagnostic.td:236:
/home/gha/actions-runner/_work/llvm-project/llvm-project/clang/include/clang/Basic/DiagnosticSemaKinds.td:1775:5:
 error: Duplicate enumerator name 'VirtualFunction'
def note_unsatisfied_trait_reason
    ^
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/clang-tblgen:
 1 errors.
```

https://github.com/llvm/llvm-project/pull/144161
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