Rename PCHReader to ASTReader.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111467 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index fa95879..6f0c8ce 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -2911,7 +2911,7 @@
   }
 }
 
-void ASTWriter::SetReader(PCHReader *Reader) {
+void ASTWriter::SetReader(ASTReader *Reader) {
   assert(Reader && "Cannot remove chain");
   assert(FirstDeclID == NextDeclID &&
          FirstTypeID == NextTypeID &&