Replace all target specific implicit def instructions with a target independent one: TargetInstrInfo::IMPLICIT_DEF.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48380 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Alpha/AlphaCodeEmitter.cpp

@@ -95,9 +95,6 @@ void AlphaCodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
     case Alpha::ALTENT:
     case Alpha::PCLABEL:
     case Alpha::MEMLABEL:
-    case Alpha::IDEF_I:
-    case Alpha::IDEF_F32:
-    case Alpha::IDEF_F64:
       break; //skip these
     }
   }