Bug 814472 - Add jump(Register) method to Ion macro assembler. r=jandem

js/src/ion/arm/MacroAssembler-arm.h

@@ -486,6 +486,9 @@ class MacroAssemblerARMCompat : public MacroAssemblerARM
     void jump(Label *label) {
         as_b(label);
     }
+    void jump(Register reg) {
+        ma_bx(reg);
+    }
 
     void neg32(Register reg) {
         ma_neg(reg, reg, SetCond);

js/src/ion/shared/MacroAssembler-x86-shared.h

@@ -175,6 +175,9 @@ class MacroAssemblerX86Shared : public Assembler
     void jump(RepatchLabel *label) {
         jmp(label);
     }
+    void jump(Register reg) {
+        jmp(Operand(reg));
+    }
 
     void convertInt32ToDouble(const Register &src, const FloatRegister &dest) {
         cvtsi2sd(Operand(src), dest);