Dedicated SV copying code in place of Perl_sv_setsv_flags#23202

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richardleach wants to merge 10 commits intoPerl:bleadfrom

richardleach:S_sv_freshcopy_flags

Commits on May 8, 2025

sv_inline.h - add new_XPVIV and new_XPV() macros
richardleach
committed
Perl_sv_setsv_flags - use sflags rather than doing SvPOK_only(dsv)
richardleach
committed
Extract S_SvPV_shared_hkey_or_CoWable logic from Perl_sv_setsv_flags
richardleach
committed