Fix a thinko in the creation of temporary files for the precompiled preamble

llvm-svn: 110804
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index b287522..fe4768d 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -561,10 +561,11 @@
     TmpDir = "/tmp";
   llvm::sys::Path P(TmpDir);
   P.appendComponent("preamble");
+  P.appendSuffix("pch");
   if (P.createTemporaryFileOnDisk())
     return std::string();
   
-  P.appendSuffix("pch");
+  fprintf(stderr, "Preamble file: %s\n", P.str().c_str());
   return P.str();
 }