selfhost+test: decompose user-struct by-value params (#11)

wwstage param-slot allocator dispatched isfloat/istagged/isslice/
isstr/catch-all and skipped TY_STRUCT. `fn(a: S, b: S)` where S is
16B emitted $16 frame (DI/SI only); cstage emits $32 (DI/SI/DX/CX)
per SysV ABI.

Two-site fix mirroring cmd/w6c/cgen.c:6820 (callee prologue) and
:4240 (caller push):

- New structparamsize(c, t) helper in cgenutil.ww resolves the
  TY_STRUCT TNAME chain, returns totsize for sizes (0,16], else 0.
  >16B drops to stack — bug-compat with cstage's <=16 gate.
- New struct arm in cgfnparams + matching cgfn pre-scan in
  cgendecl.ww. nw = (size>8) ? 2 : 1; partial-fit stitch (idx=5
  + nw=2) emits one reg + one stack tail.
- New struct branch in pushargsrev N_IDENT arm: MOVQ + PUSHQ
  high→low so cgcall's existing pop drains correctly.

Test 717: 4 rows × {cstage, wwstage, asm-id}. Headline 2×16B,
mixed 16B+8B (caller-side surface), str+struct regression guard,
partial-fit 5×i64+16B stitch.

Makefile

@@ -240,6 +240,7 @@ TESTS	= $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
 	  $(BIN)/test_tagged_return_scratch \
 	  $(BIN)/test_tagged_widen_f64 \
 	  $(BIN)/test_match_spill_pointer_payload \
+	  $(BIN)/test_struct_byval_param \
 	  $(BIN)/test_param_shadow_mod \
 	  $(BIN)/test_localoff_scope \
 	  $(BIN)/test_cast_enum_movl \
@@ -491,6 +492,12 @@ $(BIN)/test_match_spill_pointer_payload: test/wcc/716_match_spill_pointer_payloa
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
+$(BIN)/test_struct_byval_param: test/wcc/717_struct_byval_param.c \
+		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
+		$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
+		$(LIB)/libwwrt.a | $(BIN)
+	$(CC) $(CFLAGS) -o $@ $<
+
 $(BIN)/test_use_promote_alias: test/wcc/699_use_promote_alias.c \
 		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
 		$(LIB)/libwwrt.a | $(BIN)