Reviewers: William Hesse,

Message:
This turns out to be a useful step on the way to handling jump targets
properly.

Description:
Experimental: use the Result class to manage the lifetime of registers
returned by the register allocator.

It was simplest to move it to the register allocator source file.
Implemented copy constructor and assignment operator for results.
Some minor cleanup.

Please review this at http://codereview.chromium.org/15037

SVN Base: http://v8.googlecode.com/svn/branches/experimental/toiger/

Affected files:
   M     src/codegen-ia32.cc
   M     src/register-allocator-ia32.h
   M     src/register-allocator-ia32.cc
   M     src/virtual-frame-ia32.h
   M     src/virtual-frame-ia32.cc



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