Suppress UNCHECKED_CAST instead of CAST_NEVER_SUCCEEDS in several places

This is related to KT-6611 being fixed recently. Note that not all cases of
incorrect "cast never succeeds" were fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/IntrinsicArrayConstructors.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-@file:Suppress("unused", "UNCHECKED_CAST", "CAST_NEVER_SUCCEEDS")
+@file:Suppress("unused", "UNCHECKED_CAST")
 
 package org.jetbrains.kotlin.codegen.intrinsics
 

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/results/OverloadingConflictResolver.kt

@@ -256,11 +256,9 @@ class OverloadingConflictResolver(
 
     companion object {
         // Different smartcasts may lead to the same candidate descriptor wrapped into different ResolvedCallImpl objects
-        @Suppress("CAST_NEVER_SUCCEEDS")
         private fun <D : CallableDescriptor> uniquifyCandidatesSet(candidates: Collection<MutableResolvedCall<D>>): Set<MutableResolvedCall<D>> =
                 THashSet<MutableResolvedCall<D>>(candidates.size, getCallHashingStrategy<MutableResolvedCall<D>>()).apply { addAll(candidates) }
 
-        @Suppress("CAST_NEVER_SUCCEEDS")
         private fun <C> newResolvedCallSet(expectedSize: Int): MutableSet<C> =
                 THashSet<C>(expectedSize, getCallHashingStrategy<C>())