[turbofan] Also optimize unsigned division by constant.

src/arm64/macro-assembler-arm64-inl.h

Index: src/arm64/macro-assembler-arm64-inl.h
diff --git a/src/arm64/macro-assembler-arm64-inl.h b/src/arm64/macro-assembler-arm64-inl.h
index 22c49efbc350b7d6b5266f860975e5d7adb4b29f..4a4d644daebba183245b40365ba519dc23fb58cf 100644
--- a/src/arm64/macro-assembler-arm64-inl.h
+++ b/src/arm64/macro-assembler-arm64-inl.h
@@ -1126,6 +1126,14 @@ void MacroAssembler::Smulh(const Register& rd,
 }
 
 
+void MacroAssembler::Umull(const Register& rd, const Register& rn,
+                           const Register& rm) {
+  DCHECK(allow_macro_instructions_);
+  DCHECK(!rd.IsZero());
+  umaddl(rd, rn, rm, xzr);
+}
+
+
 void MacroAssembler::Stnp(const CPURegister& rt,
                           const CPURegister& rt2,
                           const MemOperand& dst) {