[llvm] [RISCV] Add zero-store merging and load-from-store promotion (PR #192662)

[Djordje Todorovic via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -mattr=+Xmipslsp -use-riscv-mips-load-store-pairs=1 -verify-machineinstrs < %s \
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djtodoro wrote:

It is used. We enable the feature if 1) target supports it 2) option is set to true.

https://github.com/llvm/llvm-project/pull/192662