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

llvm-svn: 48380
diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.cpp b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
index babee6a..35d6313 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
@@ -877,6 +877,8 @@
       return TAI->getInlineAsmLength(MI->getOperand(0).getSymbolName());
     if (MI->getOpcode() == ARM::LABEL)
       return 0;
+    if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF)
+      return 0;
     assert(0 && "Unknown or unset size field for instr!");
     break;
   case ARMII::Size8Bytes: return 8;          // Arm instruction x 2.