Systemize RGBLINK testing

test/link/high-low/a.asm

@@ -0,0 +1,22 @@
+ldhilo : MACRO
+    ld  HIGH(\1),LOW(\2)
+ENDM
+
+SECTION "r0", ROM0[$0]
+ld HIGH(af),a
+ld HIGH(bc),LOW(bc)
+ld LOW(bc),HIGH(bc)
+ld HIGH(de),LOW(de)
+ld LOW(de),HIGH(de)
+    ldhilo hl, hl
+ld LOW(hl),HIGH(hl)
+
+db HIGH(label+$AB)
+db LOW(label+$AB)
+
+db HIGH($1234)
+db LOW($1234)
+
+SECTION "o",OAM
+DS $10
+label:

test/link/high-low/b.asm

@@ -0,0 +1,18 @@
+SECTION "r0", ROM0[$0]
+ld a,a
+ld b,c
+ld c,b
+ld d,e
+ld e,d
+ld h,l
+ld l,h
+
+db ((label+$AB) >> 8) & $FF
+db (label+$AB) & $FF
+
+db ($1234 >> 8) & $FF
+db $1234 & $FF
+
+SECTION "o",OAM
+DS $10
+label: