[modules] Don't bother registering loaded macros if there are none.

We don't yet have a reduced testcase for this.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@236454 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 0dd9d2e460eda9eb72b2693a289869d7f9a6c123..c4b4aec24a04858d3d0750ac2e62dc9f27dc26f7 100644 (file)
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -1829,7 +1829,8 @@ void ASTReader::resolvePendingMacro(IdentifierInfo *II,
     Earliest = MD;
   }
 
-  PP.setLoadedMacroDirective(II, Latest);
+  if (Latest)
+    PP.setLoadedMacroDirective(II, Latest);
 }
 
 ASTReader::InputFileInfo