Derek Schuff e110897e28 [WEbAssembly] Clear frame base vreg in explicit-locals when stack pointer is dead ...

Having an alloca in a function causes the stack pointer to be generated in the
prolog, but if it's unused other than for debug info, explicit-locals will drop
it and not allocate a local. In this case we need to reset the FrameBaseVreg.

Differential Revision: https://reviews.llvm.org/D76784

2020-03-26 13:07:32 -07:00

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