[builtins] Introduce a proper BUILTIN frame type.

[builtins] Introduce a proper BUILTIN frame type.

This adds a new BUILTIN frame type, which supports variable number of
arguments for builtins implemented in hand-written native code (we will
extend this mechanism to TurboFan builtins at some point). Convert the
Math.max and Math.min builtins to construct a BUILTIN frame if required.

This does not yet work for C++ builtins, but that'll be the next step.

R=jarin@chromium.org
BUG=v8:4815
LOG=n

[Jarin, 2016-04-20 11:47:57]

lgtm.

https://codereview.chromium.org/1902373002/diff/1/src/frames.cc
File src/frames.cc (right):

https://codereview.chromium.org/1902373002/diff/1/src/frames.cc#newcode459
src/frames.cc:459: return OPTIMIZED;
What would go wrong if you also optimized functions returned BUILTIN type?
(Pointer maps?)

https://codereview.chromium.org/1902373002/diff/1/src/frames.h
File src/frames.h (right):

https://codereview.chromium.org/1902373002/diff/1/src/frames.h#newcode957
src/frames.h:957: // Builtin frames are built for builtins with JavaScript
linkage, like
Nit: like -> such as