[MacroExpansionContext] Fix a warning.

This patch fixes:

  error: private field 'PP' is not used [-Werror,-Wunused-private-field]

diff --git a/clang/lib/Analysis/MacroExpansionContext.cpp b/clang/lib/Analysis/MacroExpansionContext.cpp
index bb5095a114cb66c7870583b86971b2fee0e84018..f261ba8d538957ec1442c750cecc86907113dc68 100644 (file)
--- a/clang/lib/Analysis/MacroExpansionContext.cpp
+++ b/clang/lib/Analysis/MacroExpansionContext.cpp
@@ -46,6 +46,7 @@ public:
       return SM.getExpansionLoc(Range.getEnd()).getLocWithOffset(1);
     }();
 
+    (void)PP;
     LLVM_DEBUG(llvm::dbgs() << "MacroExpands event: '";
                dumpTokenInto(PP, llvm::dbgs(), MacroName);
                llvm::dbgs()