Jakob Stoklund Olesen 874be74179 Rework the global split cost calculation.
The global cost is the sum of block frequencies for spill code that must be
inserted because preferences weren't met.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127062 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-05 03:28:51 +00:00
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