wcc: narrow integer pointer-deref load width via localloadop (#116)

TK_STAR integer arm now routes through localloadop (cstage cgen.c) /
localloadop (wwstage cgenexpr.ww) — load-twin of the landed signed-
narrow-scalar-reads fix, was omitting TK_STAR. Closes the *p (CMPQ,
full-width arith) miscompile family (#116 + 962/963 instances all
fixed by the same width-aware load). Float arm untouched (#96 already
routed via X0). New test 947 (10 rows): packed CMPQ + signed/unsigned
narrow widths + TY_NAMED/TBANG alias + TY_ENUM peel + i64/bool controls.

cmd/w6c/cgen.c

@@ -2315,7 +2315,22 @@ cgexpr(Cg *c, Node *n, Local *locals)
 				ins2(c, node_isf32(n) ? A_MOVSS : A_MOVSD,
 				    amem(D_AX, 0), areg(D_X0));
 			} else {
-				ins2(c, A_MOVQ, amem(D_AX, 0), areg(D_AX));
+				/* Load-twin of the signed-narrow-scalar-reads
+				 * sweep (project_cgen_int_cast_no_truncate);
+				 * TK_STAR was the omitted site, refiled as
+				 * #116. A raw MOVQ pulls 8 bytes through a
+				 * narrow `*iN` and overlaps the next element
+				 * — the `*p` value reads honest only when the
+				 * caller's sink happens to truncate (i32 store,
+				 * i32 return). Width-preserving sinks (CMPQ,
+				 * 64-bit arith) saw garbage in the high bytes.
+				 * localloadop keys MOVSXD/MOVSWQ/MOVSBQ +
+				 * MOVL/MOVZWQ/MOVZBQ off n->type, with the
+				 * TY_NAMED / TY_ENUM peel pre-folded so an
+				 * aliased narrow (`type err = !i32`) lands on
+				 * the right opcode. */
+				ins2(c, localloadop(n->type),
+				    amem(D_AX, 0), areg(D_AX));
 			}
 			break;
 		default: break;