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For spills into a large stack frame, the FI-elimination code uses the register scavenger to obtain a free GPR for use with an r+r-addressed load or store. When there are no available GPRs, the scavenger gets one by using its spill slot. Previously, we were not always allocating that spill slot and the RS would assert when the spill slot was needed. I don't currently have a small test that triggered the assert, but I've created a small regression test that verifies that the spill slot is now added when the stack frame is sufficiently large. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177140 91177308-0d34-0410-b5e6-96231b3b80d8
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