Implemented b{and,or,xor}_not bitops for ty_int_ref_scalar_64 type. (#5604)

* Implemented `b{and,or,xor}_not` bitops for ty_int_ref_scalar_64 type.

* Added tests.

cranelift/filetests/filetests/runtests/bnot.clif

@@ -35,3 +35,34 @@ block0(v0: i64):
 }
 ; run: %bnot_i64(0) == -1
 ; run: %bnot_i64(1) == -2
+
+
+function %band_not(i8, i8) -> i8 {
+block0(v0: i8, v1: i8):
+    v2 = band_not.i8 v0, v1
+    return v2
+}
+
+; run: %band_not(0xFF, 0) == -1
+; run: %band_not(0x55, 0xFF) == 0
+; run: %band_not(0, 0) == 0
+
+function %bor_not(i8, i8) -> i8 {
+block0(v0: i8, v1: i8):
+    v2 = bor_not.i8 v0, v1
+    return v2
+}
+
+; run: %bor_not(0xFF, 0) == -1
+; run: %bor_not(0x55, 0xFF) == 85
+; run: %bor_not(0, 0) == -1
+
+function %bxor_not(i8, i8) -> i8 {
+block0(v0: i8, v1: i8):
+    v2 = bxor_not.i8 v0, v1
+    return v2
+}
+
+; run: %bxor_not(0xFF, 0) == 0
+; run: %bxor_not(0x55, 0xFF) == 85
+; run: %bxor_not(0, 0) == -1