[clang] [clang][deps][modules] Allocate input file paths lazily (PR #114457)

[Jan Svoboda via cfe-commits]

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@@ -21,6 +21,16 @@ using namespace clang;
 using namespace tooling;
 using namespace dependencies;
 
+void ModuleDeps::forEachFileDep(llvm::function_ref<void(StringRef)> Cb) const {
+  SmallString<0> PathBuf;
+  PathBuf.reserve(256);
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jansvoboda11 wrote:

Curious what people think of having the caller provide this. If the caller used the same buffer for multiple `ModuleDeps` objects, we could avoid even more allocations. I haven't tested the perf of that scheme.

https://github.com/llvm/llvm-project/pull/114457