Read all integer op parameters using a signed integer type.

src/compiler/representation-change.h

Index: src/compiler/representation-change.h
diff --git a/src/compiler/representation-change.h b/src/compiler/representation-change.h
index 9538684af2339a20033d12fdad3c45d72872da41..ffb86d16a26709d657296ab749f9ee50716566e0 100644
--- a/src/compiler/representation-change.h
+++ b/src/compiler/representation-change.h
@@ -75,7 +75,7 @@ class RepresentationChanger {
         return node;  // No change necessary.
       case IrOpcode::kInt32Constant:
         if (output_type & kTypeUint32) {
-          uint32_t value = OpParameter<uint32_t>(node);
+          uint32_t value = static_cast<uint32_t>(OpParameter<int32_t>(node));
           return jsgraph()->Constant(static_cast<double>(value));
         } else if (output_type & kTypeInt32) {
           int32_t value = OpParameter<int32_t>(node);
@@ -125,7 +125,7 @@ class RepresentationChanger {
             DoubleToFloat32(OpParameter<double>(node)));
       case IrOpcode::kInt32Constant:
         if (output_type & kTypeUint32) {
-          uint32_t value = OpParameter<uint32_t>(node);
+          uint32_t value = static_cast<uint32_t>(OpParameter<int32_t>(node));
           return jsgraph()->Float32Constant(static_cast<float>(value));
         } else {
           int32_t value = OpParameter<int32_t>(node);
@@ -169,7 +169,7 @@ class RepresentationChanger {
         return jsgraph()->Float64Constant(OpParameter<double>(node));
       case IrOpcode::kInt32Constant:
         if (output_type & kTypeUint32) {
-          uint32_t value = OpParameter<uint32_t>(node);
+          uint32_t value = static_cast<uint32_t>(OpParameter<int32_t>(node));
           return jsgraph()->Float64Constant(static_cast<double>(value));
         } else {
           int32_t value = OpParameter<int32_t>(node);