feat: make NOT operant to be bool normalized

Author: boriel

src/arch/z80/peephole/opts/020_o1_bool_norm_empty.opt

@@ -26,5 +26,5 @@ IF {{
   "call .core.__GEF", "call .core.__LEI16", "call .core.__LEI8", "call .core.__LTI8",
   "call .core.__ANDF", "call .core.__EQF", "call .core.__GTF", "call .core.__LTI16",
   "call .core.__LEF", "call .core.__LEI32", "call .core.__LTF", "call .core.__LTI32",
-  "call .core.__NEF")
+  "call .core.__NEF", "call .core.__NOTF")
 }}

tests/functional/arch/zx48k/not16.asm

@@ -33,6 +33,7 @@ _b:
 	or l
 	sub 1
 	sbc a, a
+	neg
 	ld (_b), a
 	ld hl, 0
 	ld b, h

tests/functional/arch/zx48k/not8.asm

@@ -31,6 +31,7 @@ _b:
 	ld a, (_a)
 	sub 1
 	sbc a, a
+	neg
 	ld (_b), a
 	ld hl, 0
 	ld b, h