A spans result (the compiler proved only some captures are read) used to
run the full per-capture decision for every group. Slots now start as
present undefined with a zero payload, and only the selected and lazy
capture bits are visited; full results visit every capture as before.
The hole-free prefix is measured after the fill.
String-array teardown keeps its storage pointers in registers across the
release calls (releasing a string runs no user code), and regex group
parseInt takes the short-decimal path inline (shared with
scr_parse_int_bytes as scr_parse_int_short_digits) with signed
conversions where the values are known to be far below 2^53.
Malte Ubl
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