replace 'trait' keyword with 'interface' in user-visible messages and code generation tools

compiler/testData/renderer/Classes.kt

@@ -56,7 +56,7 @@ public trait TwoUpperBounds<T> where T : Number, T : Any
 //public constructor Inner() defined in rendererTest.TheClass.Inner
 //internal final class InternalClass defined in rendererTest
 //public constructor InternalClass() defined in rendererTest.InternalClass
-//internal trait TheTrait defined in rendererTest
+//internal interface TheTrait defined in rendererTest
 //internal abstract fun abstractFun(): kotlin.Unit defined in rendererTest.TheTrait
 //internal companion object : rendererTest.TheClass<kotlin.Int, kotlin.Int> defined in rendererTest.TheTrait
 //private constructor Companion() defined in rendererTest.TheTrait.Companion
@@ -65,5 +65,5 @@ public trait TwoUpperBounds<T> where T : Number, T : Any
 //public constructor WithReified<reified A, reified out B>() defined in rendererTest.WithReified
 //<reified A> defined in rendererTest.WithReified
 //<reified out B> defined in rendererTest.WithReified
-//public trait TwoUpperBounds<T : kotlin.Number> where T : kotlin.Any defined in rendererTest
+//public interface TwoUpperBounds<T : kotlin.Number> where T : kotlin.Any defined in rendererTest
 //<T : kotlin.Number & kotlin.Any> defined in rendererTest.TwoUpperBounds

compiler/testData/renderer/GlobalFunctions.kt

@@ -31,8 +31,8 @@ deprecated("") fun deprecatedFun()
 //public fun <out T> withTypeParam(a: kotlin.Array<T>): kotlin.Int defined in rendererTest
 //<out T> defined in rendererTest.withTypeParam
 //value-parameter val a: kotlin.Array<T> defined in rendererTest.withTypeParam
-//internal trait Foo defined in rendererTest
-//internal trait Bar defined in rendererTest
+//internal interface Foo defined in rendererTest
+//internal interface Bar defined in rendererTest
 //internal fun <P : rendererTest.Foo> funTypeParameterWithTwoUpperBounds(): kotlin.Int where P : rendererTest.Bar defined in rendererTest
 //<P : rendererTest.Foo & rendererTest.Bar> defined in rendererTest.funTypeParameterWithTwoUpperBounds
 //kotlin.deprecated internal fun deprecatedFun(): kotlin.Unit defined in rendererTest

compiler/testData/renderer/InheritedMembersVisibility.kt

@@ -15,7 +15,7 @@ class B : A {
         get
 }
 
-//internal trait A defined in root package
+//internal interface A defined in root package
 //internal abstract val v: kotlin.Int defined in A
 //public abstract var int: kotlin.Int defined in A
 //private abstract fun <set-int>(<set-?>: kotlin.Int): kotlin.Unit defined in A

compiler/testData/renderer/KeywordsInNames.kt

@@ -20,7 +20,7 @@ val NOT_IS = 3
 //internal final annotation class `true` : kotlin.Annotation defined in root package
 //public constructor `true`() defined in `true`
 //internal val `val`: kotlin.Int defined in root package
-//`true` internal trait `trait` defined in root package
+//`true` internal interface `trait` defined in root package
 //internal final class `class`<`in`> defined in root package
 //<`in`> defined in `class`
 //public constructor `class`<`in`>(p: `in`?) defined in `class`