implement the microsoft/gnu "__COUNTER__" macro: rdar://4329310


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68933 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index b916dea..fa6ad6f 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -318,7 +318,11 @@
     switch (RecType) {
     default:  // Default behavior: ignore unknown records.
       break;
-        
+    case pch::PP_COUNTER_VALUE:
+      if (!Record.empty())
+        PP.setCounterValue(Record[0]);
+      break;
+
     case pch::PP_MACRO_OBJECT_LIKE:
     case pch::PP_MACRO_FUNCTION_LIKE: {
       IdentifierInfo *II = DecodeIdentifierInfo(Record[0]);