Update the PTH performance "script".

llvm-svn: 82718

Author: rjmccall

clang/NOTES.txt

@@ -16,8 +16,8 @@ This is similar to -Eonly.
 Creating and using a PTH file for performance measurement (use a release-asserts
 build).
 
-$ clang -x objective-c-header INPUTS/Cocoa_h.m -o /tmp/tokencache
-$ clang -token-cache /tmp/tokencache INPUTS/Cocoa_h.m
+$ clang -ccc-pch-is-pth -x objective-c-header INPUTS/Cocoa_h.m -o /tmp/tokencache
+$ clang-cc -token-cache /tmp/tokencache INPUTS/Cocoa_h.m
 
 //===---------------------------------------------------------------------===//