Initial (stub) port of jump targets to the ARM platform....

Initial (stub) port of jump targets to the ARM platform.

The JumpTarget and VirtualFrame classes have been split out into their own
source files, with platform-specific include and implementation files.

Much of the code can ultimately be shared.

Committed: http://code.google.com/p/v8/source/detail?r=712

[Kevin Millikin (Chromium), 2008-11-04 14:32:06]

This change is merely to get ARM to compile and work again after the changes to
the AST and platform-independed code generator functions.

The virtual frame is always NULL (it's a placeholder for use in the
platform-independent codegen.cc file) and the jump targets essentially just wrap
a label.

[Kevin Millikin (Chromium), 2008-11-07 10:40:42]

Erik, can you take a look at this?  It's a port of IA32 code to the ARM, mostly
stubbed out.  I've also moved some code to separate files.

Genuine comments are welcome.

[Erik Corry, 2008-11-07 11:55:10]

LGTM

http://codereview.chromium.org/9328/diff/220/233
File src/jump-target-arm.h (right):

http://codereview.chromium.org/9328/diff/220/233#newcode35
Line 35: //
-------------------------------------------------------------------------
Almost everything in this file looks architecture independent - should be
factored out at some point.

http://codereview.chromium.org/9328/diff/220/232
File src/jump-target.h (right):

http://codereview.chromium.org/9328/diff/220/232#newcode31
Line 31: #if defined(ARM) || defined (__arm__) || defined(__thumb__)
This is kinda messy.  I don't have a better suggestion right now, but perhaps
the solution becomes obvious once the commonality is factored out of these two
include files.

http://codereview.chromium.org/9328/diff/220/226
File src/virtual-frame-ia32.cc (right):

http://codereview.chromium.org/9328/diff/220/226#newcode46
Line 46: parameter_count_ = cgen->scope()->num_parameters();
I think you should be using the initalizer list syntax here.