[clang] [clang modules] Setting `DebugCompilationDir` when it is safe to ignore current working directory (PR #128446)

[Qiongsi Wu via cfe-commits]

================
@@ -492,8 +492,23 @@ static std::string getModuleContextHash(const ModuleDeps 
&MD,
   auto &FSOpts = const_cast<FileSystemOptions &>(CI.getFileSystemOpts());
   if (CWD && !IgnoreCWD)
     HashBuilder.add(*CWD);
-  else
+  else {
     FSOpts.WorkingDir.clear();
+    auto &CGOpts = const_cast<CodeGenOptions &>(CI.getCodeGenOpts());
----------------
qiongsiwu wrote:

Got it! Thanks! Fixed! 

https://github.com/llvm/llvm-project/pull/128446
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