[arm] Drop useless branches in full and lithium codegen.

src/arm/macro-assembler-arm.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1239 matching lines @@
   void TrySmiTag(Register reg, Label* not_a_smi) {
     TrySmiTag(reg, reg, not_a_smi);
   }
   void TrySmiTag(Register reg, Register src, Label* not_a_smi) {
     SmiTag(ip, src, SetCC);
     b(vs, not_a_smi);
     mov(reg, ip);
   }
 
 
-  void SmiUntag(Register reg, SBit s = LeaveCC) {
-    mov(reg, Operand::SmiUntag(reg), s);
+  void SmiUntag(Register reg, SBit s = LeaveCC, Condition cond = al) {
+    mov(reg, Operand::SmiUntag(reg), s, cond);
   }
   void SmiUntag(Register dst, Register src, SBit s = LeaveCC) {
     mov(dst, Operand::SmiUntag(src), s);
   }
 
   // Untag the source value into destination and jump if source is a smi.
   // Souce and destination can be the same register.
   void UntagAndJumpIfSmi(Register dst, Register src, Label* smi_case);
 
   // Untag the source value into destination and jump if source is not a smi.
@@ skipping 271 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_