PPC/s390: fix endianess issue in Generate_InterpreterEntryTrampoline

R=joransiu@ca.ibm.com

Change-Id: I97c8e5034cf3541707bf5f5d22359cdcf66f87e1
Reviewed-on: https://chromium-review.googlesource.com/1011585Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52584}

src/builtins/ppc/builtins-ppc.cc

@@ -1079,8 +1079,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   ExternalReference debug_execution_mode =
       ExternalReference::debug_execution_mode_address(masm->isolate());
   __ mov(r7, Operand(debug_execution_mode));
-  __ lbz(r7, MemOperand(r7));
-  __ extsb(r7, r7);
+  __ lwz(r7, MemOperand(r7));
   STATIC_ASSERT(static_cast<int>(DebugInfo::kDebugExecutionMode) ==
                 static_cast<int>(DebugInfo::kSideEffects));
   __ cmp(r7, ip);

src/builtins/s390/builtins-s390.cc

@@ -1086,7 +1086,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   ExternalReference debug_execution_mode =
       ExternalReference::debug_execution_mode_address(masm->isolate());
   __ mov(r6, Operand(debug_execution_mode));
-  __ LoadB(r6, MemOperand(r6));
+  __ LoadW(r6, MemOperand(r6));
   STATIC_ASSERT(static_cast<int>(DebugInfo::kDebugExecutionMode) ==
                 static_cast<int>(DebugInfo::kSideEffects));
   __ CmpP(r6, ip);