PPC/s390: [turbofan] JSGenericLowering mostly uses builtins instead of code stubs now

Port 0c168a90

R=tebbi@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2397193003
Cr-Commit-Position: refs/heads/master@{#40059}

src/crankshaft/ppc/lithium-codegen-ppc.cc

@@ -5373,8 +5373,8 @@ void LCodeGen::DoTypeof(LTypeof* instr) {
   __ mov(r3, Operand(isolate()->factory()->number_string()));
   __ b(&end);
   __ bind(&do_call);
-  TypeofStub stub(isolate());
-  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  Callable callable = CodeFactory::Typeof(isolate());
+  CallCode(callable.code(), RelocInfo::CODE_TARGET, instr);
   __ bind(&end);
 }
 

src/crankshaft/s390/lithium-codegen-s390.cc

@@ -5284,8 +5284,8 @@ void LCodeGen::DoTypeof(LTypeof* instr) {
   __ mov(r2, Operand(isolate()->factory()->number_string()));
   __ b(&end);
   __ bind(&do_call);
-  TypeofStub stub(isolate());
-  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+  Callable callable = CodeFactory::Typeof(isolate());
+  CallCode(callable.code(), RelocInfo::CODE_TARGET, instr);
   __ bind(&end);
 }