remove rule and tests

cranelift/codegen/src/preopt.peepmatic

@@ -113,9 +113,6 @@
 ;; Replace with negative 1.
 (=> (bor_imm -1 $x) -1)
 
-;; Other replacments
-(=> (bxor_imm -1 $x) (bnot $x))
-
 ;; Transform `[(x << N) >> N]` into a (un)signed-extending move.
 ;;
 ;; i16 -> i8 -> i16

cranelift/filetests/filetests/peepmatic/simplify64.clif

@@ -324,17 +324,3 @@ block0(v0: i32):
 ; nextln:    v1 = iadd_imm v0, 42
 ; nextln:    nop
 ; nextln:    return v2
-
-function %bxor_imm_32(i32) -> i32 {
-block0(v0: i32):
-    v1 = bxor_imm v0, -1
-    ; check: bnot v0
-    return v1
-}
-
-function %bxor_imm_64(i64) -> i64 {
-block0(v0: i64):
-    v1 = bxor_imm v0, -1
-    ; check: bnot v0
-    return v1
-}