X87: Unify the stack layout for construct frames.

port 876ae425 (r29292).

original commit message:

   The stack layout was different for different ports.

BUG=

Review URL: https://codereview.chromium.org/1219823002

Cr-Commit-Position: refs/heads/master@{#29412}

src/x87/frames-x87.h

@@ -93,7 +93,6 @@ class ConstructFrameConstants : public AllStatic {
  public:
   // FP-relative.
   static const int kImplicitReceiverOffset = -5 * kPointerSize;
-  static const int kConstructorOffset      = kMinInt;
   static const int kLengthOffset           = -4 * kPointerSize;
   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;