[turbofan] Fix a -Wsign-compare error under GCC 4.9.2.

Review URL: https://codereview.chromium.org/1230063011

Cr-Commit-Position: refs/heads/master@{#29632}

diff --git a/src/compiler/linkage-impl.h b/src/compiler/linkage-impl.h
index 5b638034c8cbeaf7e141eda55d0d71150ba3bdcf..c779a623f9a3b87567e6e75ee224ddbfd664ccc2 100644 (file)
--- a/src/compiler/linkage-impl.h
+++ b/src/compiler/linkage-impl.h
@@ -235,7 +235,7 @@ class LinkageHelper {
 
   static CallDescriptor* GetInterpreterDispatchDescriptor(
       Zone* zone, const MachineSignature* msig) {
-    DCHECK_EQ(0, msig->parameter_count());
+    DCHECK_EQ(0U, msig->parameter_count());
     LocationSignature::Builder locations(zone, msig->return_count(),
                                          msig->parameter_count());
     AddReturnLocations(&locations);