Suppress K2 specific warnings in the codebase

^KT-62472

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/MethodInliner.kt

@@ -421,6 +421,7 @@ class MethodInliner(
 
             private fun getNewIndex(`var`: Int): Int {
                 val lambdaInfo = inliningContext.lambdaInfo
+                @Suppress("USELESS_IS_CHECK") // K2 warning suppression, TODO: KT-62472
                 if (reorderIrLambdaParameters && lambdaInfo is IrExpressionLambda) {
                     val extensionSize = if (lambdaInfo.isExtensionLambda) lambdaInfo.invokeMethod.argumentTypes[0].size else 0
                     return when {

compiler/backend/src/org/jetbrains/kotlin/codegen/inlineClassesCodegenUtil.kt

@@ -48,6 +48,7 @@ fun classFileContainsMethod(descriptor: FunctionDescriptor, state: GenerationSta
             (descriptor.containingDeclaration as DeserializedClassDescriptor).classId ?: return null
         }
         descriptor.containerSource is JvmPackagePartSource -> {
+            @Suppress("USELESS_CAST") // K2 warning suppression, TODO: KT-62472
             (descriptor.containerSource as JvmPackagePartSource).classId
         }
         else -> {

compiler/backend/src/org/jetbrains/kotlin/codegen/state/KotlinTypeMapper.kt

@@ -610,6 +610,7 @@ class KotlinTypeMapper @JvmOverloads constructor(
 
                 val isAccessor = property is AccessorForPropertyDescriptor
                 val propertyName = if (isAccessor)
+                    @Suppress("USELESS_CAST") // K2 warning suppression, TODO: KT-62472
                     (property as AccessorForPropertyDescriptor).accessorSuffix
                 else
                     property.name.asString()