add a hasMacroDefinition() method to IdentifierInfo, strength reduce a
call to getMacroInfo to call it.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42725 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Lex/HeaderSearch.cpp b/Lex/HeaderSearch.cpp
index 96c8693..00a36ee 100644
--- a/Lex/HeaderSearch.cpp
+++ b/Lex/HeaderSearch.cpp
@@ -329,7 +329,8 @@
   
   // Next, check to see if the file is wrapped with #ifndef guards.  If so, and
   // if the macro that guards it is defined, we know the #include has no effect.
-  if (FileInfo.ControllingMacro && FileInfo.ControllingMacro->getMacroInfo()) {
+  if (FileInfo.ControllingMacro &&
+      FileInfo.ControllingMacro->hasMacroDefinition()) {
     ++NumMultiIncludeFileOptzn;
     return false;
   }