Language: encapsed Undefined variable Warning cites user site (#32034)

[PurHur]

Summary

• Encapsed/heredoc $undefined warnings cited the previous statement (often error_reporting on line 2) because ConcatList CONCAT/CAST_STRING opcodes had no sourceLocation.
• Stamp those opcodes from the ConcatList user site (heredoc: first body line, php-parser KIND_HEREDOC) and advance JIT callSiteLine from opcode sourceLocation.
• php-src: Zend/zend_compile.c zend_compile_encapsed_string FETCH_R lineno. PHP: lib/Compiler.php ConcatList lowering + lib/JIT.php opline stamp.

Closes #32034

Test plan

• Issue repros vs Zend 8.2.32 (VM + JIT)
• ./script/phpunit.sh --filter EncapsedUndefVarWarningLine32034
• Nearby warning-line / encapsed tests (ListDestructUndefKeyLine31994, ForeachScalarWarningLine, EncapsedCoalesce)
• Full VMTest / JITTest not run (path-slash --filter on those suites is known-broken; dedicated providers cover this case)

Verification

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_undef_var_encapsed_line.php'

VM (matches Zend): warnings on lines 3, 4, 5, 6 (was 2, 3, 3, 3).

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_undef_var_heredoc_line.php'

VM (matches Zend): warning on line 4 (was 2).

./script/docker-exec.sh -- bash -lc 'php bin/jit.php test/repro/maintainer_gap_undef_var_encapsed_line.php'
./script/docker-exec.sh -- bash -lc 'php bin/jit.php test/repro/maintainer_gap_undef_var_heredoc_line.php'

JIT same lines as Zend.

./script/phpunit.sh --filter EncapsedUndefVarWarningLine32034

OK (VM + JIT dedicated PHPT).

php-src-strict; no php-compiler-strict shortcut. No new runtime/*.c.

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