[JS] Manually change receiver's type of Char's equals method

Char's equals method in js doesn't work properly because now equals
method is not fake override in Char, but it is actual override and so
when we call equals for some char in js, it will not be boxed. To fix
it we need to get correct receiver's type.

js/js.translator/src/org/jetbrains/kotlin/js/translate/callTranslator/CallInfo.kt

@@ -16,6 +16,8 @@
 
 package org.jetbrains.kotlin.js.translate.callTranslator
 
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.contracts.parsing.isEqualsDescriptor
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
@@ -137,8 +139,12 @@ private fun TranslationContext.createCallInfo(
 
     var dispatchReceiver = getDispatchReceiver()
     var dispatchReceiverType = resolvedCall.smartCastDispatchReceiverType ?: resolvedCall.dispatchReceiver?.type
-    if (dispatchReceiverType != null && (resolvedCall.resultingDescriptor as? FunctionDescriptor)?.kind?.isReal == false) {
-        dispatchReceiverType = TranslationUtils.getDispatchReceiverTypeForCoercion(resolvedCall.resultingDescriptor)
+    if (dispatchReceiverType != null) {
+        if ((resolvedCall.resultingDescriptor as? FunctionDescriptor)?.kind?.isReal == false) {
+            dispatchReceiverType = TranslationUtils.getDispatchReceiverTypeForCoercion(resolvedCall.resultingDescriptor)
+        } else if (KotlinBuiltIns.isChar(dispatchReceiverType) && resolvedCall.resultingDescriptor.isEqualsDescriptor()) {
+            dispatchReceiverType = resolvedCall.resultingDescriptor.overriddenDescriptors.single().dispatchReceiverParameter!!.type
+        }
     }
     var extensionReceiver = getExtensionReceiver()
     var notNullConditional: JsConditional? = null