PreprocessorOptions: Get rid of unnecessary 'isPTH' flag for include entries.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@86757 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 75e475a..15ea901 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -492,10 +492,10 @@
   // Process -include directives.
   for (PreprocessorOptions::include_iterator I = InitOpts.include_begin(),
        E = InitOpts.include_end(); I != E; ++I) {
-    if (I->second) // isPTH
-      AddImplicitIncludePTH(PredefineBuffer, PP, I->first);
+    if (*I == InitOpts.getImplicitPTHInclude())
+      AddImplicitIncludePTH(PredefineBuffer, PP, *I);
     else
-      AddImplicitInclude(PredefineBuffer, I->first);
+      AddImplicitInclude(PredefineBuffer, *I);
   }
 
   // Null terminate PredefinedBuffer and add it.