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

[Haojian Wu via cfe-commits]

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@@ -1901,9 +1903,8 @@ class SourceManager : public 
RefCountedBase<SourceManager> {
 
   FileID getFileID(SourceLocation::UIntTy SLocOffset) const {
     // If our one-entry cache covers this offset, just return it.
-    if (isOffsetInFileID(LastFileIDLookup, SLocOffset))
+    if (SLocOffset >= LastLookupStartOffset && SLocOffset < 
LastLookupEndOffset)
----------------
hokein wrote:

good idea!

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