Make start label of LVT record the point where variable becomes alive

Otherwise, there will be overlapping LVT records, which leads to
removal of the whole LVT by R8.
 #KT-44714 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineTransformerMethodVisitor.kt

@@ -1252,8 +1252,7 @@ private fun updateLvtAccordingToLiveness(method: MethodNode, isForNamedFunction:
         for (insnIndex in 0 until (method.instructions.size() - 1)) {
             val insn = method.instructions[insnIndex]
             if (!isAlive(insnIndex, variableIndex) && isAlive(insnIndex + 1, variableIndex)) {
-                val lvtRecord = oldLvt.findRecord(insnIndex, variableIndex) ?: continue
-                startLabel = max(lvtRecord.start, previousSuspensionPointLabel(insn))
+                startLabel = insn as? LabelNode ?: insn.findNextOrNull { it is LabelNode } as? LabelNode
             }
             if (isAlive(insnIndex, variableIndex) && !isAlive(insnIndex + 1, variableIndex)) {
                 // No variable in LVT -> do not add one

compiler/testData/codegen/bytecodeText/coroutines/debug/localVariableCorrectLabel.kt

@@ -15,7 +15,7 @@ fun main(args: Array<String>) {
 suspend fun SequenceScope<Int>.awaitSeq(): Int = 42
 
 
-// 1 LOCALVARIABLE a I L[0-9]+ L4
+// 1 LOCALVARIABLE a I L[0-9]+ L19
 
 /* TODO: JVM_IR does not generate LINENUMBER at the end of the lambda */
 // JVM_TEMPLATES