Run destructors of MacroInfo objects to free memory they allocate. This...

Run destructors of MacroInfo objects to free memory they allocate.  This addresses <rdar://problem/6506035>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@62498 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Lex/Preprocessor.cpp

@@ -98,7 +98,9 @@ Preprocessor::~Preprocessor() {
        Macros.begin(), E = Macros.end(); I != E; ++I) {
     // We don't need to free the MacroInfo objects directly.  These
     // will be released when the BumpPtrAllocator 'BP' object gets
-    // destroyed.
+    // destroyed. We still need to run the dstor, however, to free
+    // memory alocated by MacroInfo.
+    I->second->~MacroInfo();    
     I->first->setHasMacroDefinition(false);
   }