JS: do not report declaration clash when common redeclaration diagnostic applies. See KT-14577

compiler/testData/diagnostics/testsWithJsStdLib/name/declarationClash.kt

@@ -0,0 +1,37 @@
+// FILE: first.kt
+package foo
+
+class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>A<!>
+class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>C<!>
+class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>C<!>
+
+<!CONFLICTING_OVERLOADS!>fun f(): Int<!> = 23
+<!CONFLICTING_OVERLOADS!>fun f(): Int<!> = 99
+
+<!CONFLICTING_OVERLOADS!>fun g(): String<!> = "23"
+<!CONFLICTING_OVERLOADS!>fun g(): Int<!> = 23
+
+val <!REDECLARATION!>x<!>: Int = 42
+val <!REDECLARATION!>x<!>: Int = 99
+
+val <!REDECLARATION!>y<!>: String = "42"
+val <!REDECLARATION!>y<!>: Int = 42
+
+class B {
+    <!CONFLICTING_OVERLOADS!>fun f(): Int<!> = 23
+    <!CONFLICTING_OVERLOADS!>fun f(): Int<!> = 99
+
+    <!CONFLICTING_OVERLOADS!>fun g(): String<!> = "23"
+    <!CONFLICTING_OVERLOADS!>fun g(): Int<!> = 23
+
+    val <!REDECLARATION!>x<!>: Int = 42
+    val <!REDECLARATION!>x<!>: Int = 99
+
+    val <!REDECLARATION!>y<!>: String = "42"
+    val <!REDECLARATION!>y<!>: Int = 42
+}
+
+// FILE: second.kt
+package foo
+
+class <!PACKAGE_OR_CLASSIFIER_REDECLARATION!>A<!>

compiler/testData/diagnostics/testsWithJsStdLib/name/declarationClash.txt

@@ -0,0 +1,55 @@
+package
+
+package foo {
+    public val x: kotlin.Int = 42
+    public val x: kotlin.Int = 99
+    public val y: kotlin.Int = 42
+    public val y: kotlin.String = "42"
+    public fun f(): kotlin.Int
+    public fun f(): kotlin.Int
+    public fun g(): kotlin.Int
+    public fun g(): kotlin.String
+
+    public final class A {
+        public constructor A()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class A {
+        public constructor A()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class B {
+        public constructor B()
+        public final val x: kotlin.Int = 42
+        public final val x: kotlin.Int = 99
+        public final val y: kotlin.Int = 42
+        public final val y: kotlin.String = "42"
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final fun f(): kotlin.Int
+        public final fun f(): kotlin.Int
+        public final fun g(): kotlin.Int
+        public final fun g(): kotlin.String
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class C {
+        public constructor C()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+
+    public final class C {
+        public constructor C()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}