simplify PTHManager::CreateLexer


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index fd7c367..12f8330 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -668,7 +668,8 @@
 }
 
 
-PTHLexer* PTHManager::CreateLexer(FileID FID, const FileEntry* FE) {
+PTHLexer *PTHManager::CreateLexer(FileID FID) {
+  const FileEntry *FE = PP->getSourceManager().getFileEntryForID(FID);
   if (!FE)
     return 0;