S390X: [turbofan] Word32 loads should be unsigned.

src/compiler/s390/instruction-selector-s390.cc

Index: src/compiler/s390/instruction-selector-s390.cc
diff --git a/src/compiler/s390/instruction-selector-s390.cc b/src/compiler/s390/instruction-selector-s390.cc
index e96b7e76c5bf542bd2483530c0396f5a3b93c45f..929b61882bb359f56b57567e92fe98909cdbe09d 100644
--- a/src/compiler/s390/instruction-selector-s390.cc
+++ b/src/compiler/s390/instruction-selector-s390.cc
@@ -182,11 +182,7 @@ void InstructionSelector::VisitLoad(Node* node) {
     case MachineRepresentation::kTagged:  // Fall through.
 #endif
     case MachineRepresentation::kWord32:
-      opcode = kS390_LoadWordS32;
-#if V8_TARGET_ARCH_S390X
-      // TODO(john.yan): Remove this mode since s390 do not has this restriction
-      mode = kInt16Imm_4ByteAligned;
-#endif
+      opcode = kS390_LoadWordU32;
       break;
 #if V8_TARGET_ARCH_S390X
     case MachineRepresentation::kTagged:  // Fall through.