Clear the OpAction field before setting it. This allows a target to set

an instruction operation action to Expand, then set it to Legal later.

llvm-svn: 25812

include/llvm/Target/TargetLowering.h

@@ -368,6 +368,7 @@ protected:
                           LegalizeAction Action) {
     assert(VT < 32 && Op < sizeof(OpActions)/sizeof(OpActions[0]) &&
            "Table isn't big enough!");
+    OpActions[Op] &= ~(3ULL << VT*2);
     OpActions[Op] |= Action << VT*2;
   }