[llvm] [TableGen] correctly escape dependency filenames (PR #160834)

[Jay Foad via llvm-commits]

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@@ -83,6 +85,35 @@ static int reportError(const char *ProgName, Twine Msg) {
   return 1;
 }
 
+/// Escape a filename in the dependency file so that it is correctly
+/// interpreted by `make`. This is consistent with Clang, GCC, and lld.
+static TGLexer::DependenciesSetTy::value_type escapeDependencyFilename(
+    const TGLexer::DependenciesSetTy::value_type &Filename) {
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jayfoad wrote:

Using `TGLexer::DependenciesSetTy::value_type` seems over-complicated. Maybe just take a StringRef and return a std:string?

https://github.com/llvm/llvm-project/pull/160834