Fix an assert failure with a funclet in a swifttailcc function. #8219
+131
−2
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The failure happens in the livedebugvalues pass.
swiftcc is already covered by isCallingConvWin64. I believe that the assert is checking that the particular calling convention uses a frame pointer, which swifttailcc does, and being relatively a recent addition, it wasn't covered by this code.
This cherrypicks the main PR #8211