Separate Stmt::Destroy into the entrypoint for destroying a statement
or expression (Destroy) from the virtual function used to actually
destroy a given expression (DoDestroy). 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78375 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index 842caa8..0f3cbe1 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -111,10 +111,9 @@
                 TokLocs, NumConcatenated);
 }
 
-void StringLiteral::Destroy(ASTContext &C) {
+void StringLiteral::DoDestroy(ASTContext &C) {
   C.Deallocate(const_cast<char*>(StrData));
-  this->~StringLiteral();
-  C.Deallocate(this);
+  Expr::DoDestroy(C);
 }
 
 void StringLiteral::setStrData(ASTContext &C, const char *Str, unsigned Len) {
@@ -218,7 +217,7 @@
   SubExprs = new (C) Stmt*[1];
 }
 
-void CallExpr::Destroy(ASTContext& C) {
+void CallExpr::DoDestroy(ASTContext& C) {
   DestroyChildren(C);
   if (SubExprs) C.Deallocate(SubExprs);
   this->~CallExpr();
@@ -1657,7 +1656,7 @@
   memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs);
 }
 
-void SizeOfAlignOfExpr::Destroy(ASTContext& C) {
+void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) {
   // Override default behavior of traversing children. If this has a type
   // operand and the type is a variable-length array, the child iteration
   // will iterate over the size expression. However, this expression belongs
@@ -1668,7 +1667,7 @@
     C.Deallocate(this);
   }
   else
-    Expr::Destroy(C);
+    Expr::DoDestroy(C);
 }
 
 //===----------------------------------------------------------------------===//
@@ -1831,9 +1830,9 @@
   NumDesignators = NumDesignators - 1 + NumNewDesignators;
 }
 
-void DesignatedInitExpr::Destroy(ASTContext &C) {
+void DesignatedInitExpr::DoDestroy(ASTContext &C) {
   delete [] Designators;
-  Expr::Destroy(C);
+  Expr::DoDestroy(C);
 }
 
 ImplicitValueInitExpr *ImplicitValueInitExpr::Clone(ASTContext &C) const {