Reviewers: William Hesse,

Description:
Simplify JumpTarget::ComputeEntryFrame.  Eliminate a separate pass
over the frame elements to find registers used (before allocating
undetermined elements) and another pass to set the frame's register
indices (after allocating all elements).

Please review this at http://codereview.chromium.org/114018

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
   M     src/arm/register-allocator-arm.cc
   M     src/ia32/register-allocator-ia32.cc
   M     src/jump-target.cc
   M     src/register-allocator.h



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