Minor: Extract a const for continuation variable name

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

@@ -322,7 +322,7 @@ class CoroutineTransformerMethodVisitor(
         methodNode.instructions.insert(methodNode.instructions.last, endLabel)
         methodNode.localVariables.add(
             LocalVariableNode(
-                "\$continuation",
+                CONTINUATION_VARIABLE_NAME,
                 languageVersionSettings.continuationAsmType().descriptor,
                 null,
                 startLabel,

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

@@ -124,6 +124,8 @@ val INITIAL_SUSPEND_DESCRIPTOR_FOR_DO_RESUME = object : CallableDescriptor.UserD
 
 val CONTINUATION_PARAMETER_NAME = Name.identifier("continuation")
 
+const val CONTINUATION_VARIABLE_NAME = "\$continuation"
+
 // Resolved calls to suspension function contain descriptors as they visible within coroutines:
 // E.g. `fun <V> await(f: CompletableFuture<V>): V` instead of `fun <V> await(f: CompletableFuture<V>, machine: Continuation<V>): Unit`
 // See `createJvmSuspendFunctionView` and it's usages for clarification