fix(tie,MakeMaker): AUTOLOAD fallback + INST_ARCHLIBDIR expansion

[fglock]

Summary

Two bugs surfaced while running jcpan -t AI::Prolog. Before: 14 of 19 test files failed to load at all. After: 460/460 tests pass.

1. Tie — Do not fall through to AUTOLOAD for UNTIE/DESTROY

Retying an already-tied hash (as Regexp::Common does in its import when loading sub-modules that themselves use Regexp::Common) triggers an implicit untie. TiedVariableBase::tieCallIfExists, TieHash::tieCallIfExists, TieArray::tieCallIfExists, and TieHandle::tieCallIfExists used InheritanceResolver.findMethodInHierarchy, which transparently falls back to AUTOLOAD when the method doesn't exist.

That invoked Regexp::Common's sub AUTOLOAD { _croak "Can't $AUTOLOAD" } with an unset $AUTOLOAD, producing the cryptic error Can't at .../balanced.pm line 9. and breaking every module that depends on Regexp::Common.

Per Perl semantics, UNTIE/DESTROY on tied variables are "if exists" only and must not trigger AUTOLOAD dispatch. Fix: reject AUTOLOAD-resolved matches (detected via code.autoloadVariableName != null) in all four tieCallIfExists helpers.

Minimal repro:

package Foo;
our %RE;
sub TIEHASH { bless {}, shift }
sub AUTOLOAD { our $AUTOLOAD; die "Can't $AUTOLOAD" }
tie %RE, __PACKAGE__;
tie %RE, __PACKAGE__;  # was: Can't     now: ok

2. MakeMaker — Expand $(INST_ARCHLIBDIR) / $(INST_AUTODIR) + tolerate missing generated sources

Term::ReadKey's Makefile.PL uses PM => { 'ReadKey.pm' => '$(INST_ARCHLIBDIR)/ReadKey.pm' }. PerlOnJava's MakeMaker only expanded INST_LIB / INST_ARCHLIB / INST_LIBDIR, leaving INST_ARCHLIBDIR literal → mkdir: : No such file or directory.

• Derive <parent> / <full> paths from NAME and expand INST_LIBDIR, INST_ARCHLIBDIR, INST_AUTODIR, INST_ARCHAUTODIR (both $(...) and ${...} forms) per standard EUMM conventions.
• Make _shell_cp tolerant of missing source files. Some distributions (like Term::ReadKey) generate .pm from a .pm.PL that requires XS bootstrap; PerlOnJava can't run that, but the install should still succeed so dependent modules can proceed.

Test plan

• make — all unit tests pass
• jcpan -t AI::Prolog — 460/460 tests pass (was 14/19 files failing)
• jcpan -i Term::ReadKey — installs (with graceful skip of the missing generated .pm)
• Minimal tie; tie repro now matches perl behavior (TIEHASH runs on re-tie; DESTROY is dispatched via AUTOLOAD with $AUTOLOAD correctly set)

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