Alex Bradbury 1e4e4646ad [RISCV] Support lowering FrameIndex
Introduces the AddrFI "addressing mode", which is necessary simply because 
it's not possible to write a pattern that directly matches a frameindex.

Ensure callee-saved registers are accessed relative to the stackpointer. This
is necessary as callee-saved register spills are performed before the frame
pointer is set.

Move HexagonDAGToDAGISel::isOrEquivalentToAdd to SelectionDAGISel, so we can 
make use of it in the RISC-V backend.

Differential Revision: https://reviews.llvm.org/D39848


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320353 91177308-0d34-0410-b5e6-96231b3b80d8
2017-12-11 11:53:54 +00:00
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