[clang] [ASTWriter] Do not allocate source location space for module maps used only for textual headers (PR #116374)

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``````````bash
git-clang-format --diff 469f9d5fb8fcfe7dc42baa2daa7e230147f234de ff328f256824e30b2c3c8db184a0fcafaef32637 --extensions cpp -- clang/test/Modules/prune-non-affecting-module-map-repeated-textual.cpp clang/lib/Serialization/ASTWriter.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index a0d0e03178..9b81d7c53f 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -195,7 +195,8 @@ GetAffectingModuleMaps(const Preprocessor &PP, Module *RootModule) {
   };
   llvm::DenseMap<FileID, AffectedReason> ModuleMaps;
   llvm::DenseMap<const Module *, AffectedReason> ProcessedModules;
-  auto CollectModuleMapsForHierarchy = [&](const Module *M, AffectedReason Reason) {
+  auto CollectModuleMapsForHierarchy = [&](const Module *M,
+                                           AffectedReason Reason) {
     M = M->getTopLevelModule();
 
     // We need to process the header either when it was not present of when we

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https://github.com/llvm/llvm-project/pull/116374