Commits on Dec 23, 2019

1. Custom MemRef lowering to LLVM …

   This PR introduces the infrastructure to provide a custom Std-to-LLVM
   lowering for MemRef type:
   * MemRefDescriptor class is turned into an abstract API that defines
     the methods needed to perform the custom lowering.
   * Existing MemRefDesriptor class is renamed to DefaultMemRefDescriptor.
     It provides default struct lowering implementation (NFC).
   * TestCustomMemRefLLVMLowering.cpp implements a custom MemRef
     descriptor lowering and LLVM type converter with the basic
     functionality to lower MemRef type to a plain pointer to element type.
   * convert-memref-ops.mlir is split into convert-static-memref-ops.mlir
     and `convert-dynamic-memref-ops.mlir` so that
     TestCustomMemRefLLVMLowering.cpp can be tested on all the static
     MemRef tests available.
   
   Related discussion: tensorflow#309

   

   dcaballe committed Dec 23, 2019
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