tweak word shift unroll

compiler/src/prog8/compiler/target/c64/codegen/assignment/AugmentableAssignmentAsmGen.kt

@@ -881,7 +881,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                         else
                             asmgen.out("  lda  #0 |  sta  $name")
                     }
-                    value>2 -> asmgen.out("""
+                    value>3 -> asmgen.out("""
                         ldy  #$value
 -                       asl  $name
                         rol  $name+1

examples/test.p8

@@ -5,16 +5,6 @@
 
 main {
     sub start() {
-        uword uw
-        ubyte ub1
-        ubyte ub2
-
-        uw = ub1 as uword + ub2     ; fairly ok asm.. but the next though...:
-        ub1++
-        uw = ub1 + ub2          ; TODO horrible asm using the eval stack... fix
-
-        uw *= 8     ; TODO is using a loop... unroll somewhat
-
         txt.print("hello\n")
     }
 }