[AST] Forbid copy/move of statements/types

Statements, expressions and types are not supposed to be copied/moved,
and trying to do so is only going to result in tears. Someone tripped
on this a few days ago on the mailing list. NFC.

Differential Revision: https://reviews.llvm.org/D60123

Reviewed By: aaron.ballman



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@358283 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/Stmt.h

@@ -1042,6 +1042,11 @@ class alignas(void *) Stmt {
     return static_cast<StmtClass>(StmtBits.sClass);
   }
 
+  Stmt(const Stmt &) = delete;
+  Stmt(Stmt &&) = delete;
+  Stmt &operator=(const Stmt &) = delete;
+  Stmt &operator=(Stmt &&) = delete;
+
   const char *getStmtClassName() const;
 
   bool isOMPStructuredBlock() const { return StmtBits.IsOMPStructuredBlock; }

include/clang/AST/Type.h

@@ -1813,7 +1813,9 @@ class Type : public ExtQualsTypeCommonBase {
   friend class ASTWriter;
 
   Type(const Type &) = delete;
+  Type(Type &&) = delete;
   Type &operator=(const Type &) = delete;
+  Type &operator=(Type &&) = delete;
 
   TypeClass getTypeClass() const { return static_cast<TypeClass>(TypeBits.TC); }