Fix goto LABEL resolution in loop bodies under subtest

[fglock]

Summary

Enabling the upstream/original Test::More (from Test-Simple) caused src/test/resources/unit/control_flow.t to fail inside subtest with:

• Can't find label NEXT at ... control_flow.t line 201

This PR fixes local label resolution for goto LABEL inside loop-body blocks by ensuring loop body labels are registered in gotoLabelStack while emitting the loop body.

Problem Details

Reproducer

./jperl src/test/resources/unit/control_flow.t

Root cause

EmitControlFlow.handleGotoLabel() determines whether goto LABEL is local via:

• ctx.javaClassInfo.findGotoLabelsByName(labelName)

The failing construct parses such that the label is scoped to the loop body block:

• For1Node.Body.BlockNode.labels: NEXT
• and an explicit LabelNode: NEXT:

However, EmitForeach.emitFor1() emitted the loop body statements directly without registering any goto labels for that body BlockNode. As a result, goto NEXT was treated as non-local and eventually raised an uncaught marker error.

Why upstream Test::More exposes this

Upstream Test::More runs subtest bodies via Test::Builder->subtest, wraps the callback in an eval, and then dies if it failed. This makes label-resolution failures inside subtests fatal and aborts the test file before done_testing().

Changes

1) Register loop-body goto labels in EmitForeach

File: src/main/java/org/perlonjava/codegen/EmitForeach.java

• Added helper methods to push/pop goto labels for a BlockNode.
• When For1Node.body is a BlockNode, push labels before emitting statements and pop them after.

This makes forward and backward goto LABEL work correctly inside loop bodies.

2) Pre-register statement labels in EmitBlock

File: src/main/java/org/perlonjava/codegen/EmitBlock.java

• Pre-register LabelNode statement labels for blocks emitted via EmitBlock.

3) Enable upstream Test::More import

Files:

• dev/import-perl5/config.yaml
• src/main/perl/lib/Test/More.pm

This switches Test::More to the upstream/original code path that surfaced the issue.

Tests

• make passes
• ./jperl src/test/resources/unit/control_flow.t passes

Notes

• This PR addresses local goto LABEL resolution during compilation.
• It does not implement goto EXPR (computed labels), which remains skipped in control_flow.t.