[PATCH] D128135: [DAGCombiner][ARM][RISCV] Teach ShrinkLoadReplaceStoreWithStore to use truncstore.

[Craig Topper via Phabricator via llvm-commits]

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The VT we want to shrink to may not be legal especially after type
legalization.

Fixes PR56110.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128135

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/ARM/illegal-bitfield-loadstore.ll
  llvm/test/CodeGen/RISCV/pr56110.ll

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