Process unrolled foreach iteration body in original context

[ondrejmirtes]

Summary

• The unrolled-constant-array foreach path was processing each iteration's body with $context->enterDeep(), which suppresses LOOP_SCOPE_ITERATIONS stabilization in nested loops. Because unrolling visits each element exactly once (no outer iteration to converge accumulators), nested loops inside the body produced single-element constant arrays instead of stabilized list/non-empty-list types.
• Fixed by passing the original $context to processStmtNodesInternal, so nested loops inside an unrolled iteration's body can stabilize on their own (the non-unrolled path still uses enterDeep because the outer 3-iteration loop is what makes accumulators converge there).
• Added regression tests bug-14543.php and bug-9332.php for the reported cases.
• Updated bug-14489.php expectation to the more precise array{array{1}, array{4}} since the inner foreach over a fully-known constant array now also unrolls and produces precise sequential types (verified to match runtime output via php -r).

Test plan

• vendor/bin/phpunit tests/PHPStan/Analyser/NodeScopeResolverTest.php — 1557 tests, 0 failures
• New regression tests pass with the fix and fail without it
• Manual reproduction from the bug reports now reports the precise types

Closes phpstan/phpstan#9332
Closes phpstan/phpstan#14543

🤖 Generated with Claude Code