- Change MachineInstr::findRegisterDefOperandIdx so it can also look for defs

that are aliases of the specified register.
- Rename modifiesRegister to definesRegister since it's looking a def of the
specific register or one of its super-registers. It's not looking for def of a
sub-register or alias that could change the specified register.
- Added modifiesRegister to look for defs of aliases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104377 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/TwoAddressInstructionPass.cpp

@@ -780,7 +780,7 @@ canUpdateDeletedKills(SmallVector<unsigned, 4> &Kills,
     if (!LastKill)
       return false;
 
-    bool isModRef = LastKill->modifiesRegister(Kill);
+    bool isModRef = LastKill->definesRegister(Kill);
     NewKills.push_back(std::make_pair(std::make_pair(Kill, isModRef),
                                       LastKill));
   }