Add a clear() operation to MCInst, to drop all of its operands. Useful for the disassembler, where we may realize fairly late into decoding that something is wrong and need to reset.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136634 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCInst.h

@@ -144,6 +144,8 @@ public:
     Operands.push_back(Op);
   }
 
+  void clear() { Operands.clear(); }
+
   void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
   void dump() const;