[llvm] [RISCV] Use SHL_ADD in remaining strength reduce cases for MUL (PR #89789)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> /home/dtcxzyw/llvm-codegen/actions-runner/_work/llvm-codegen-benchmark/llvm-codegen-benchmark/llvm/llvm-project/llvm/lib/Target/RISCV/RISCVInstrInfoZb.td:767:19: error: Variable not defined: 'riscv_shl_add'
  def : Pat<(i64 (riscv_shl_add (and GPR:$rs1, 0xFFFFFFFF), (i64 i), GPR:$rs2)),


https://github.com/llvm/llvm-project/pull/89789