Fix labeled continue targeting a for-of loop (Issue #1577 Crash #1)

`L: for (const v of [...]) { continue L; }` aborted with
Assertion `!v.isEmpty()' failed, and `continue OUTER` from a nested
loop silently terminated the script.

A `continue <label>` whose label targets a for-of loop was left to be
resolved by LabelledStatementNode after the loop body, by which point
the for-of iterator-cleanup try block had registered the jump as a
complex case. It was then morphed into a JumpComplexCase that unwound
the try block, wrongly closing the iterator and leaving an empty Value
in the result register.

A previous per-loop attempt (8fd141b2) was reverted (60b1202a) because
a single m_currentLoopLabel leaked into nested loops and broke test262.

Track all labels directly targeting a loop (m_currentLoopLabels), clear
the list when entering each loop body so nested loops never inherit it,
and let for-of/for-in resolve continues for its own labels to
continuePosition (a plain jump, identical to an unlabeled continue)
before the try block is registered as a complex case.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Seonghyun Kim <sh8281.kim@samsung.com>

src/interpreter/ByteCodeGenerator.cpp

@@ -64,7 +64,6 @@ ByteCodeGenerateContext::ByteCodeGenerateContext(InterpretedCodeBlock* codeBlock
     , m_lexicalBlockIndex(0)
     , m_classInfo()
     , m_numeralLiteralData(numeralLiteralData) // should be NumeralLiteralVector
-    , m_currentLoopLabel(nullptr)
 #if defined(ENABLE_TCO)
     , m_returnRegister(SIZE_MAX)
 #endif