Removed useless as casts from compiler code

It allows compiling code with K2 and enabled `-Werror`

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

@@ -194,8 +194,7 @@ class PsiInlineCodegen(
     override fun reorderArgumentsIfNeeded(actualArgsWithDeclIndex: List<ArgumentAndDeclIndex>, valueParameterTypes: List<Type>) = Unit
 
     override fun isInlinedToInlineFunInKotlinRuntime(): Boolean {
-        val codegen = this.codegen as? ExpressionCodegen ?: return false
-        val caller = codegen.context.functionDescriptor
+        val caller = this.codegen.context.functionDescriptor
         if (!caller.isInline) return false
         val callerPackage = DescriptorUtils.getParentOfType(caller, PackageFragmentDescriptor::class.java) ?: return false
         return callerPackage.fqName.asString().startsWith("kotlin.")

compiler/backend/src/org/jetbrains/kotlin/codegen/range/PrimitiveNumberRangeIntrinsicRangeValue.kt

@@ -65,8 +65,7 @@ abstract class PrimitiveNumberRangeIntrinsicRangeValue(
 
         return when (comparisonGenerator.comparedType) {
             Type.DOUBLE_TYPE, Type.FLOAT_TYPE -> {
-                val rangeLiteral = getBoundedValue(codegen) as? BoundedValue
-                    ?: throw AssertionError("Floating point intrinsic range value should be a range literal")
+                val rangeLiteral = getBoundedValue(codegen)
                 InFloatingPointRangeLiteralExpressionGenerator(operatorReference, rangeLiteral, comparisonGenerator, codegen.frameMap)
             }
             else ->