eagerly resolve the spelling locations of macro argument preexpansions.

This reduces fsyntax-only time on c99-intconst-1.c from 2.43s down to 
2.01s (20%), reducing the number of fileid lookups from 2529040 linear 
and 64771121 binary to 5625902 linear and 4151182 binary.

This knocks getFileID down to only 4.6% of compile time on this testcase.
At this point, malloc/free is over 35% of compile time, primarily allocating
MacroArgs objects and their argument preexpansion vectors.

I don't feel like malloc avoiding right now, so I'm just going to call
this good.

llvm-svn: 62994

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Lex/PPMacroExpansion.cpp b/clang/lib/Lex/PPMacroExpansion.cpp
index 518c84e8c38..b14df735ad1 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -359,7 +359,7 @@ MacroArgs *Preprocessor::ReadFunctionLikeMacroArgs(Token &MacroName,
     Token EOFTok;
     EOFTok.startToken();
     EOFTok.setKind(tok::eof);
-    EOFTok.setLocation(Tok.getLocation());
+    EOFTok.setLocation(SourceMgr.getSpellingLoc(Tok.getLocation()));
     EOFTok.setLength(0);
     ArgTokens.push_back(EOFTok);
     ++NumActuals;