X87: Small changes in preparation for Hydrogen-generated KeyedLoadGeneric

Port r21535(8bb4c2b)

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/302453011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21550 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x87/lithium-x87.h

@@ -432,6 +432,7 @@ class LDummyUse V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 
 class LDeoptimize V8_FINAL : public LTemplateInstruction<0, 0, 0> {
  public:
+  virtual bool IsControl() const V8_OVERRIDE { return true; }
   DECLARE_CONCRETE_INSTRUCTION(Deoptimize, "deoptimize")
   DECLARE_HYDROGEN_ACCESSOR(Deoptimize)
 };