[PATCH]: Bug 18747 - Add an option to allow an exhaustive search during last chance recoloring

[MAYUR PANDEY]

Hi,

Attached is the patch for solving the 1st thing in the Bug 18747:
1. When the assignment fails because of the early cutoffs, this should be reported instead of the current obscur “ran out of registers”.
the discussion can be checked at http://llvm.org/bugs/show_bug.cgi?id=18747

Please review the patch.

Thanks,
Mayur
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