PPC/s390: Fix endianess issue on Generate_ConstructFunction

R=joransiu@ca.ibm.com

Change-Id: Ic44ce01e4d9487c7319125df46914a528938071d
Reviewed-on: https://chromium-review.googlesource.com/1010920Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52583}

src/builtins/ppc/builtins-ppc.cc

@@ -2384,7 +2384,7 @@ void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
 
   // Jump to JSBuiltinsConstructStub or JSConstructStubGeneric.
   __ LoadP(r7, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
-  __ LoadP(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
+  __ lwz(r7, FieldMemOperand(r7, SharedFunctionInfo::kFlagsOffset));
   __ mov(ip, Operand(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
   __ and_(r7, r7, ip, SetRC);
   __ beq(&call_generic_stub, cr0);

src/builtins/s390/builtins-s390.cc

@@ -2390,7 +2390,7 @@ void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
 
   // Jump to JSBuiltinsConstructStub or JSConstructStubGeneric.
   __ LoadP(r6, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
-  __ LoadP(r6, FieldMemOperand(r6, SharedFunctionInfo::kFlagsOffset));
+  __ LoadlW(r6, FieldMemOperand(r6, SharedFunctionInfo::kFlagsOffset));
   __ AndP(r6, Operand(SharedFunctionInfo::ConstructAsBuiltinBit::kMask));
   __ beq(&call_generic_stub);