Hojun-Cho
324df92e1d
Delete the vestigial inline slice-let builder in N_LET; a
`let s: []T = buf[lo:hi]` now routes through cgexpr's N_SLICE path
plus the generic 3-word store -- exactly as cstage's own str-let and
the wwstage already do. cap is unchanged (still hi-lo); the
cap = base_cap-lo fix is the following commit.
The builder duplicated cgexpr's N_SLICE base/hi dispatch and was a
strict subset of it, so for local bases the deletion is value-neutral
(ptr=base+lo, len=hi-lo, cap=hi-lo); only the routing bytes move,
aligning cstage down to the leaner wwstage and closing find-4
(rule-10). Verified byte-identical cs==ww across the slice-let matrix
{array,slice}x{local,global}x{hi-default,hi-explicit}.
Also fixes a cstage miscompile: the builder loaded a global-base
sub-slice via localfind->0 + BP-relative (no let_islet/masym), so a
`let s = G[lo:hi]` over a global array or slice G emitted
LEAQ/MOVQ 0(BP) garbage instead of the symbol address. Routing
through the global-aware shared path makes these correct
(ken-confirmed broken->correct).