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

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index f71c1a3852cfb362ba2b54a26c45143f69043308..944e6e89d7aa37b659348bdcd7bb8ec1a3ce8573 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -1257,8 +1257,8 @@ class MacroAssembler: public Assembler {
   }
 
 
-  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);