K2: fix field annotation splitting and frontend checks

Related to KT-57135

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/FieldAnnotationWithClasses.fir.txt

@@ -0,0 +1,34 @@
+FILE: FieldAnnotationWithClasses.kt
+    public final annotation class Ann : R|kotlin/Annotation| {
+        public constructor(vararg allowedTypes: R|kotlin/Array<out kotlin/reflect/KClass<*>>|): R|Ann| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val allowedTypes: R|kotlin/Array<out kotlin/reflect/KClass<*>>| = R|<local>/allowedTypes|
+            public get(): R|kotlin/Array<out kotlin/reflect/KClass<*>>|
+
+    }
+    public final fun foo(): R|kotlin/Unit| {
+        local final class Local : R|kotlin/Any| {
+            public constructor(): R|Local| {
+                super<R|kotlin/Any|>()
+            }
+
+            field:@FIELD:R|Ann|(allowedTypes = vararg(allowedTypes = <implicitArrayOf>(<getClass>(Q|Some|), <getClass>(Q|Other|)))) public final val x: R|kotlin/Int| = Int(42)
+                public get(): R|kotlin/Int|
+
+        }
+
+    }
+    public final class Some : R|kotlin/Any| {
+        public constructor(): R|Some| {
+            super<R|kotlin/Any|>()
+        }
+
+    }
+    public final class Other : R|kotlin/Any| {
+        public constructor(): R|Other| {
+            super<R|kotlin/Any|>()
+        }
+
+    }

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/FieldAnnotationWithClasses.kt

@@ -0,0 +1,15 @@
+// WITH_REFLECT
+
+import kotlin.reflect.*
+
+annotation class Ann(vararg val allowedTypes: KClass<*>)
+
+fun foo() {
+    class Local {
+        @field:Ann(allowedTypes = [Some::class, Other::class])
+        val x: Int = 42
+    }
+}
+
+class Some
+class Other