simplify the cache miss handling code, eliminating CacheMissing.

llvm-svn: 120038

clang/lib/Basic/FileSystemStatCache.cpp

@@ -19,16 +19,11 @@ MemorizeStatCalls::LookupResult
 MemorizeStatCalls::getStat(const char *Path, struct stat &StatBuf) {
   LookupResult Result = statChained(Path, StatBuf);
   
-  // If the chained cache didn't know anything about the file, do the stat now
-  // so we can record the result.
-  if (Result == CacheMiss)
-    Result = ::stat(Path, &StatBuf) ? CacheHitMissing : CacheHitExists;
-  
   // Do not cache failed stats, it is easy to construct common inconsistent
   // situations if we do, and they are not important for PCH performance (which
   // currently only needs the stats to construct the initial FileManager
   // entries).
-  if (Result == CacheHitMissing)
+  if (Result == CacheMissing)
     return Result;
   
   // Cache file 'stat' results and directories with absolutely paths.