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df23a60fa6
As pointed out by Richard Sandiford, my recent updates to the register scavenger broke targets that use custom spilling (because the new code assumed that if there were no valid spill slots, than spilling would be impossible). I don't have a test case, but it should be possible to create one for Thumb 1, Mips 16, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178073 91177308-0d34-0410-b5e6-96231b3b80d8
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