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58a3e2d34c
Re-land the patch with a fix of clang test. Cost of spill location is computed basing on relative branch frequency where corresponding spill/reload/copy are located. While the number itself is highly depends on incoming IR, the total cost can be used when do some changes in RA. Revert "Revert "[GreedyRA ORE] Add Cost of spill locations into remark"" This reverts commit 680f3d6de79f7dd75ee0cda256a541d18e504a22.
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