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Patchpoints already did this. Doing it for stackmaps is a convenience for the runtime in the event that it needs to scratch register to patch or perform a runtime call thunk. Unlike patchpoints, we just assume the AnyRegCC calling convention. This is the only language and target independent calling convention specific to stackmaps so makes sense. Although the calling convention is not currently used to select the scratch registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202943 91177308-0d34-0410-b5e6-96231b3b80d8
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