[llvm] [RISCV][GISEL] Add legalizer for G_BSWAP (PR #70226)

[Craig Topper via llvm-commits]

================
@@ -68,77 +68,32 @@ body:             |
     ; CHECK-NEXT: {{  $}}
     ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $x10
     ; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(s32) = COPY $x11
----------------
topperc wrote:

I believe @MaskRay was correcting my instructions on how to run the test to produce assembly. The extra properties aren't needed if you're only running the legalizer pass.

https://github.com/llvm/llvm-project/pull/70226