Read all integer op parameters using a signed integer type.

src/compiler/node-matchers.h

Index: src/compiler/node-matchers.h
diff --git a/src/compiler/node-matchers.h b/src/compiler/node-matchers.h
index d543425fca48606a0947291dc13bda6ecaa1c9cd..749b03cc2d670bba300f6f701a2392ac4e4f3766 100644
--- a/src/compiler/node-matchers.h
+++ b/src/compiler/node-matchers.h
@@ -77,6 +77,18 @@ struct ValueMatcher : public NodeMatcher {
 
 
 template <>
+inline ValueMatcher<uint32_t, IrOpcode::kInt32Constant>::ValueMatcher(
+    Node* node)
+    : NodeMatcher(node),
+      value_(),
+      has_value_(opcode() == IrOpcode::kInt32Constant) {
+  if (has_value_) {
+    value_ = static_cast<uint32_t>(OpParameter<int32_t>(node));
+  }
+}
+
+
+template <>
 inline ValueMatcher<int64_t, IrOpcode::kInt64Constant>::ValueMatcher(Node* node)
     : NodeMatcher(node), value_(), has_value_(false) {
   if (opcode() == IrOpcode::kInt32Constant) {
@@ -94,10 +106,10 @@ inline ValueMatcher<uint64_t, IrOpcode::kInt64Constant>::ValueMatcher(
     Node* node)
     : NodeMatcher(node), value_(), has_value_(false) {
   if (opcode() == IrOpcode::kInt32Constant) {
-    value_ = OpParameter<uint32_t>(node);
+    value_ = static_cast<uint32_t>(OpParameter<int32_t>(node));
     has_value_ = true;
   } else if (opcode() == IrOpcode::kInt64Constant) {
-    value_ = OpParameter<uint64_t>(node);
+    value_ = static_cast<uint64_t>(OpParameter<int64_t>(node));
     has_value_ = true;
   }
 }