Suppress K2 specific warnings in the codebase

^KT-62472

core/descriptors/src/org/jetbrains/kotlin/descriptors/descriptorUtil.kt

@@ -85,6 +85,7 @@ fun DeclarationDescriptor.containingPackage(): FqName? {
         if (container == null || container is PackageFragmentDescriptor) break
         container = container.containingDeclaration
     }
+    @Suppress("USELESS_IS_CHECK") // K2 warning suppression, TODO: KT-62472
     require(container is PackageFragmentDescriptor?)
     return container?.fqName
 }
@@ -110,4 +111,4 @@ fun FunctionDescriptor.overridesEqualsFromAny(): Boolean = name == OperatorNameC
 tailrec fun DeclarationDescriptor.findPackage(): PackageFragmentDescriptor {
     return if (this is PackageFragmentDescriptor) this
     else this.containingDeclaration!!.findPackage()
-}
+}

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorEquivalenceForOverrides.kt

@@ -71,6 +71,7 @@ object DescriptorEquivalenceForOverrides {
         return a.index == b.index // We ignore type parameter names
     }
 
+    @Suppress("NO_TAIL_CALLS_FOUND", "NON_TAIL_RECURSIVE_CALL") // K2 warning suppression, TODO: KT-62472
     private tailrec fun CallableDescriptor.singleSource(): SourceElement? {
         if (this !is CallableMemberDescriptor || kind != CallableMemberDescriptor.Kind.FAKE_OVERRIDE) return source