[clang] [clang] SourceManager: Cache offsets for LastFileIDLookup to speed up getFileID (PR #146782)

[Erich Keane via cfe-commits]

================
@@ -849,7 +850,12 @@ FileID 
SourceManager::getFileIDLocal(SourceLocation::UIntTy SLocOffset) const {
       FileID Res = FileID::get(int(GreaterIndex));
       // Remember it.  We have good locality across FileID lookups.
       LastFileIDLookup = Res;
-      NumLinearScans += NumProbes+1;
+      LastLookupStartOffset = LocalSLocEntryTable[GreaterIndex].getOffset();
+      LastLookupEndOffset =
+          GreaterIndex + 1 >= LocalSLocEntryTable.size()
----------------
erichkeane wrote:

Got it, thanks!

https://github.com/llvm/llvm-project/pull/146782
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