[Perl/perl5] 6c8256: Add padalloc_NO_SV flag for pad_alloc()

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 6c8256ccf78cae28e6b4a8b2330a21ee29807296
      https://github.com/Perl/perl5/commit/6c8256ccf78cae28e6b4a8b2330a21ee29807296
  Author: Paul "LeoNerd" Evans <[email protected]>
  Date:   2026-03-16 (Mon, 16 Mar 2026)

  Changed paths:
    M pad.c
    M pad.h
    M regen/embed.pl

  Log Message:
  -----------
  Add padalloc_NO_SV flag for pad_alloc()

This flag requests that the pad specifically doesn't have a new SV
allocated into it, as the caller may wish to do something special with
it


  Commit: 1c7eedee74225b05cc1fae2cc4b157a614001f64
      https://github.com/Perl/perl5/commit/1c7eedee74225b05cc1fae2cc4b157a614001f64
  Author: Paul "LeoNerd" Evans <[email protected]>
  Date:   2026-03-16 (Mon, 16 Mar 2026)

  Changed paths:
    M class.c
    M pad.c

  Log Message:
  -----------
  Don't allocate pad SVs for fields

Since pp_methstart is going to replace the SVs in the pad anyway,
there's no point wasting memory holding junk SVs for non-live methods
when those SVs are never going to be seen.


  Commit: d7d75569996ecf12f8d17feaae6520ed7df6fd98
      https://github.com/Perl/perl5/commit/d7d75569996ecf12f8d17feaae6520ed7df6fd98
  Author: Paul "LeoNerd" Evans <[email protected]>
  Date:   2026-03-16 (Mon, 16 Mar 2026)

  Changed paths:
    M regen/embed.pl
    M regen/scope_types.pl
    M scope.c
    M scope_types.h
    M sv.c

  Log Message:
  -----------
  Add SAVEt_PADSV_NULL, an optimised version of SAVEt_PADSV

The only current use-case of SAVEt_PADSV is invoked in class.c as part
of pp_methstart, to save the pad slot related to field SVs. This pad
slot is normally NULL until it is assigned a value by pp_methstart
itself. In this likely case, there is no point in save_padsv() storing
an extra savestack entry for this NULL pointer. Instead, we store an
optimised variant of it that sets the pad slot back to NULL on restore.


Compare: https://github.com/Perl/perl5/compare/70c62a078bd2...d7d75569996e

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