chore: rename method and remove FIXME comment.

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/AutoboxingTransformer.kt

@@ -18,8 +18,6 @@ import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.isPrimitiveArray
 import org.jetbrains.kotlin.ir.util.patchDeclarationParents
 import org.jetbrains.kotlin.ir.util.render
-import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
-import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 
 
 // Copied and adapted from Kotlin/Native
@@ -195,14 +193,14 @@ class AutoboxingTransformer(context: JsCommonBackendContext) : AbstractValueUsag
     }
 
     override fun visitCall(expression: IrCall): IrExpression {
-        if (expression.symbol == irBuiltIns.eqeqeqSymbol && expression.isAllArgumentsHaveType(irBuiltIns.charType)) {
+        if (expression.symbol == irBuiltIns.eqeqeqSymbol && expression.allArgumentsHaveType(irBuiltIns.charType)) {
             return expression.apply { transformChildrenVoid() }
         } else {
             return super.visitCall(expression)
         }
     }
 
-    private fun IrCall.isAllArgumentsHaveType(type: IrType): Boolean {
+    private fun IrCall.allArgumentsHaveType(type: IrType): Boolean {
         for (i in 0 until valueArgumentsCount) {
             if (getValueArgument(i)?.type != type) {
                 return false

js/js.translator/testData/box/char/charEquals.kt

@@ -7,7 +7,6 @@ fun box(): String {
     assertEquals(false, 'A' == 'B')
     assertEquals(false, ('A' as Any) == (65 as Any))
 
-    // FIXME(KT-50157)
     assertEquals(true, 'A' === 'A')
     assertEquals(false, 'A' === 'B')
     assertEquals(false, ('A' as Any) === (65 as Any))