--- a/js/src/ion/arm/MacroAssembler-arm.h
+++ b/js/src/ion/arm/MacroAssembler-arm.h
@@ -481,16 +481,19 @@ class MacroAssemblerARMCompat : public M
         ma_movPatchable(Imm32(imm.value), ScratchRegister, Always, L_MOVWT);
         ma_push(ScratchRegister);
         return label;
     }
 
     void jump(Label *label) {
         as_b(label);
     }
+    void jump(Register reg) {
+        ma_bx(reg);
+    }
 
     void neg32(Register reg) {
         ma_neg(reg, reg, SetCond);
     }
     void test32(Register lhs, Register rhs) {
         ma_tst(lhs, rhs);
     }
     void testPtr(Register lhs, Register rhs) {

--- a/js/src/ion/shared/MacroAssembler-x86-shared.h
+++ b/js/src/ion/shared/MacroAssembler-x86-shared.h
@@ -170,16 +170,19 @@ class MacroAssemblerX86Shared : public A
     }
 
     void jump(Label *label) {
         jmp(label);
     }
     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);
     }
     Condition testDoubleTruthy(bool truthy, const FloatRegister &reg) {
         xorpd(ScratchFloatReg, ScratchFloatReg);
         ucomisd(ScratchFloatReg, reg);
         return truthy ? NonZero : Zero;