Simplify dispatch in FullCodeGenerator::VisitCall a bit.

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index 2ed66fd03cf4cfd86573228596fcf9725b9c02b1..53c673d176d7fc8e77689befc39426366c620c90 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -3572,6 +3572,14 @@ void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
 }
 
 
+void MacroAssembler::PushRoot(Heap::RootListIndex index) {
+  UseScratchRegisterScope temps(this);
+  Register temp = temps.AcquireX();
+  LoadRoot(temp, index);
+  Push(temp);
+}
+
+
 void MacroAssembler::CompareRoot(const Register& obj,
                                  Heap::RootListIndex index) {
   UseScratchRegisterScope temps(this);