Thomas Raoux e0297a8bee [ModuloSchedule] Fix a bug in experimental expander ...

Fix two problems that popped up after my last patch. One is that the
stiching of prologue/epilogue can be wrong when reading a value from a
previsou stage. Also changed how we duplicate phi instructions to avoid
generating extra phi that we delete later.

Differential Revision: https://reviews.llvm.org/D70213

2019-11-23 16:01:47 -08:00

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