Clean up kOpCmp on ARM.

kThumb2CmnRI8M is now used.

Change-Id: I300299258ed99d86c300dee45c904c360dd44638
diff --git a/compiler/dex/quick/arm/utility_arm.cc b/compiler/dex/quick/arm/utility_arm.cc
index 4819bdf..8a8b168 100644
--- a/compiler/dex/quick/arm/utility_arm.cc
+++ b/compiler/dex/quick/arm/utility_arm.cc
@@ -596,13 +596,10 @@
       }
       break;
     case kOpCmp:
-      if (ARM_LOWREG(r_dest_src1) && short_form) {
-        opcode = (short_form) ?  kThumbCmpRI8 : kThumbCmpRR;
-      } else if (ARM_LOWREG(r_dest_src1)) {
-        opcode = kThumbCmpRR;
+      if (!neg && short_form) {
+        opcode = kThumbCmpRI8;
       } else {
         short_form = false;
-        opcode = kThumbCmpHL;
       }
       break;
     default: