Remove skip() workarounds - non-local last SKIP now works

[fglock]

Summary

With block-level dispatcher sharing (#161), non-local control flow now works correctly. The skip() function can use last SKIP directly without workarounds.

Changes

Test/More.pm

• Removed skip_internal() workaround function
• Implemented proper skip() that uses last SKIP
• Removed skip_internal from exports

TestMoreHelper.java

• Removed all skip() call rewriting logic
• Simplified to stub method with comment explaining workaround is no longer needed
• Removed ~100 lines of complex AST traversal and rewriting code

test.pl.patch

• Updated patch to remove skip_internal() addition
• Perl 5 test suite now uses native skip() implementation

How It Works Now

Before (with workarounds):

# In Test/More.pm
sub skip_internal {
    # Print skip messages but don't use last SKIP
}

# TestMoreHelper.java rewrites:
skip("reason", 2)
# Into:
(skip_internal("reason", 2) || 1) && last SKIP

After (clean implementation):

# In Test/More.pm
sub skip {
    my ($name, $count) = @_;
    for (1..$count) {
        print "ok $Test_Count # skip $name\n";
        $Test_Count++;
    }
    last SKIP;  # Non-local control flow - exits SKIP block in caller
}

# No rewriting needed - just works!

Testing

Verified non-local last SKIP works correctly:

sub inner_last {
    last SKIP;  # Exits SKIP block in caller
}

SKIP: {
    inner_last();  # Flow exits SKIP block here
    print "This never prints\n";
}
print "After SKIP block\n";  # Execution continues here

All 2012 unit tests pass (100%)

Impact

• Code cleanup: Removes ~100 lines of workaround code
• Simpler maintenance: No special skip() handling needed
• Better semantics: Uses standard Perl control flow
• Proves optimization works: Non-local control flow now reliable enough to remove workarounds

This cleanup demonstrates that the block-level dispatcher optimization (#161) provides robust, production-ready non-local control flow support.

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