[FIR] Support of REDECLARATION for local val/var, ^KT-54405 Fixed

compiler/testData/diagnostics/tests/redeclarations/RedeclaredValsAndVars.fir.kt

@@ -0,0 +1,28 @@
+// ISSUE: KT-54405
+
+class A {
+    operator fun component1() = 1
+    operator fun component2() = ""
+}
+
+fun test(b: Boolean) {
+    val <!REDECLARATION!>y<!> = 1
+    val <!REDECLARATION!>y<!> = 2
+    val <!REDECLARATION!>`_`<!> = 3
+    val <!REDECLARATION!>`_`<!> = 4
+    {
+        var <!REDECLARATION!>a<!> = 10
+        var <!REDECLARATION!>a<!> = 11
+    }
+    if (b) {
+        val z = 3
+        val <!REDECLARATION!>x<!> = 5
+        val <!REDECLARATION!>x<!> = 6
+    } else {
+        val z = 4
+    }
+}
+
+fun test2() {
+    val (`_`, _) = A()
+}

compiler/testData/diagnostics/tests/redeclarations/RedeclaredValsAndVars.kt

@@ -0,0 +1,28 @@
+// ISSUE: KT-54405
+
+class A {
+    operator fun component1() = 1
+    operator fun component2() = ""
+}
+
+fun test(b: Boolean) {
+    val <!REDECLARATION!>y<!> = 1
+    val <!NAME_SHADOWING, REDECLARATION!>y<!> = 2
+    val <!REDECLARATION!>`_`<!> = 3
+    val <!NAME_SHADOWING, REDECLARATION!>`_`<!> = 4
+    {
+        var <!REDECLARATION!>a<!> = 10
+        var <!NAME_SHADOWING, REDECLARATION!>a<!> = 11
+    }
+    if (b) {
+        val z = 3
+        val <!REDECLARATION!>x<!> = 5
+        val <!NAME_SHADOWING, REDECLARATION!>x<!> = 6
+    } else {
+        val z = 4
+    }
+}
+
+fun test2() {
+    val (`_`, _) = A()
+}

compiler/testData/diagnostics/tests/redeclarations/RedeclaredValsAndVars.txt

@@ -0,0 +1,14 @@
+package
+
+public fun test(/*0*/ b: kotlin.Boolean): kotlin.Unit
+public fun test2(): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public final operator fun component1(): kotlin.Int
+    public final operator fun component2(): kotlin.String
+    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
+}
+