--- a/js/src/jit/MacroAssembler.h
+++ b/js/src/jit/MacroAssembler.h
@@ -960,17 +960,17 @@ class MacroAssembler : public MacroAssem
     inline void branch32(Condition cond, wasm::SymbolicAddress lhs, Imm32 rhs, Label* label)
         DEFINED_ON(arm, arm64, mips_shared, x86, x64);
 
     // The supported condition are Equal, NotEqual, LessThan(orEqual), GreaterThan(orEqual),
     // Below(orEqual) and Above(orEqual).
     // When a fail label is not defined it will fall through to next instruction,
     // else jump to the fail label.
     inline void branch64(Condition cond, Register64 lhs, Imm64 val, Label* success,
-                         Label* fail = nullptr) DEFINED_ON(x86, x64, arm, mips32, mips64);
+                         Label* fail = nullptr) PER_ARCH;
     inline void branch64(Condition cond, Register64 lhs, Register64 rhs, Label* success,
                          Label* fail = nullptr) DEFINED_ON(x86, x64, arm, mips32, mips64);
     // On x86 and x64 NotEqual and Equal conditions are allowed for the branch64 variants
     // with Address as lhs. On others only the NotEqual condition.
     inline void branch64(Condition cond, const Address& lhs, Imm64 val, Label* label) PER_ARCH;
 
     // Compare the value at |lhs| with the value at |rhs|.  The scratch
     // register *must not* be the base of |lhs| or |rhs|.

--- a/js/src/jit/arm64/MacroAssembler-arm64-inl.h
+++ b/js/src/jit/arm64/MacroAssembler-arm64-inl.h
@@ -825,16 +825,22 @@ MacroAssembler::branch32(Condition cond,
 {
     vixl::UseScratchRegisterScope temps(this);
     const Register scratch = temps.AcquireX().asUnsized();
     movePtr(lhs, scratch);
     branch32(cond, Address(scratch, 0), rhs, label);
 }
 
 void
+MacroAssembler::branch64(Condition cond, Register64 lhs, Imm64 val, Label* success, Label* fail)
+{
+    MOZ_CRASH("NYI: branch64 reg-imm");
+}
+
+void
 MacroAssembler::branch64(Condition cond, const Address& lhs, Imm64 val, Label* label)
 {
     MOZ_ASSERT(cond == Assembler::NotEqual,
                "other condition codes not supported");
 
     branchPtr(cond, lhs, ImmWord(val.value), label);
 }