Improve GVN dependency tracking by adding parameters to certain flags.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index fa2deb8aa91d2c0bf0c21c990d5a90660fd6a0d2..4ac4f83fd3a23d07ec3a7961b6efd9a5a40bba89 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -565,6 +565,8 @@ void HInstruction::Verify() {
   // HValue::DataEquals.  The default implementation is UNREACHABLE.  We
   // don't actually care whether DataEquals returns true or false here.
   if (CheckFlag(kUseGVN)) DataEquals(this);
+
+  if (CheckFlag(kHasGVNParameter)) GetGVNParameter();
 }
 #endif