Fix typechecker in case of "for ((a, b) in) { }"

Fixes NDFDE

compiler/testData/diagnostics/tests/declarationChecks/multiDeclarations/ForLoopMissingLoopParameter.kt

@@ -0,0 +1,14 @@
+fun useDeclaredVariables() {
+    for ((a, b)<!SYNTAX!><!>) {
+        <!UNUSED_EXPRESSION, DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>a<!>
+        <!UNUSED_EXPRESSION, DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>b<!>
+    }
+}
+
+fun checkersShouldRun() {
+    for ((@A a, <!UNDERSCORE_IS_RESERVED!>_<!>)<!SYNTAX!><!>) {
+
+    }
+}
+
+annotation class A

compiler/testData/diagnostics/tests/declarationChecks/multiDeclarations/ForLoopMissingLoopParameter.txt

@@ -0,0 +1,11 @@
+package
+
+public fun checkersShouldRun(): kotlin.Unit
+public fun useDeclaredVariables(): kotlin.Unit
+
+public final annotation class A : kotlin.Annotation {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}