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<!>