Fix the symptom of the regression, by having the CXXConditionDeclExpr not destroy its Decl.
However, the cause still remains: the Decl is linked into the chain of its DeclContext and remains there despite being deleted.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63868 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index b95ff3e..04ee44a 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -212,12 +212,14 @@
 }
 
 void VarDecl::Destroy(ASTContext& C) {
+  Expr *Init = getInit();
+  if (Init)
+    Init->Destroy(C);
   this->~VarDecl();
   C.Deallocate((void *)this);
 }
 
 VarDecl::~VarDecl() {
-  delete getInit();
 }
 
 //===----------------------------------------------------------------------===//