Load 'equals' parameter from Java code with the name 'other'

This fixes a lot of warnings on mixed Kotlin+Java code about different names
for the same parameter because we always loaded 'equals' parameter with the
name 'p0', whereas in Kotlin we usually name it 'other'

idea/testData/quickfix/changeSignature/beforeAddParameterNotAvailableForLibrary.kt

@@ -1,5 +1,5 @@
 // "class org.jetbrains.jet.plugin.quickfix.AddFunctionParametersFix" "false"
-// ERROR: Too many arguments for public open fun equals(p0: jet.Any?): jet.Boolean defined in java.lang.Object
+// ERROR: Too many arguments for public open fun equals(other: jet.Any?): jet.Boolean defined in java.lang.Object
 
 fun f(d: java.lang.Object) {
     d.equals("a", <caret>"b")