Reviewers: Kevin Millikin, iposva,

Message:
These changes should allow comparison with a SMI constant to leave a
variable in a register.

Description:
Allow non-spilled frames into VisitCompareOperation, and allow them
to be passed from there to SmiComparison and SmiComparisonDeferred.
Profit from constants and registers in SmiComparison.

Please review this at http://codereview.chromium.org/13665

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

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



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