[clang] [clang][modules] Avoid allocations when reading blob paths (PR #113984)

[Chuanqi Xu via cfe-commits]

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@@ -1341,9 +1341,22 @@ class ASTReader
   serialization::InputFile getInputFile(ModuleFile &F, unsigned ID,
                                         bool Complain = true);
 
+  /// Buffer we use as temporary storage backing resolved paths.
+  SmallString<256> PathBuf;
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ChuanqiXu9 wrote:

Sounds... not too bad?

If we really want it, can we make the so-called global buffer to be a static 
local variable?

https://github.com/llvm/llvm-project/pull/113984
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