[FIR] Rewrite redeclaration checks

#KT-60124 Fixed
#KT-60573 Fixed

compiler/testData/diagnostics/tests/extensions/contextReceivers/conflictingWithDifferentOrder.fir.kt

@@ -3,11 +3,11 @@
 interface A
 interface B
 
-<!CONFLICTING_OVERLOADS!>context(A, B)
-fun f(): Unit<!> = TODO()
+context(A, B)
+fun f(): Unit = TODO()
 
-<!CONFLICTING_OVERLOADS!>context(B, A)
-fun f(): Unit<!> = TODO()
+context(B, A)
+fun f(): Unit = TODO()
 
 fun test(a: A, b: B) {
     <!NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER, NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>with<!>(a) {

compiler/testData/diagnostics/tests/extensions/contextReceivers/nonConflicting.fir.kt

@@ -1,20 +0,0 @@
-// !LANGUAGE: +ContextReceivers
-
-interface A
-interface B
-interface C
-interface D
-
-<!CONFLICTING_OVERLOADS!>context(A, B)
-fun f(): Unit<!> = TODO()
-
-<!CONFLICTING_OVERLOADS!>context(C, D)
-fun f(): Unit<!> = TODO()
-
-fun test(a: A, b: B) {
-    with(a) {
-        with(b) {
-            f()
-        }
-    }
-}

compiler/testData/diagnostics/tests/extensions/contextReceivers/nonConflicting.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +ContextReceivers
 
 interface A

compiler/testData/diagnostics/tests/extensions/contextReceivers/thisWithReceiverLabelsProperties.fir.kt

@@ -4,7 +4,7 @@ class A<T>(val a: T)
 class B(val b: Any)
 class C(val c: Any)
 
-<!MUST_BE_INITIALIZED!>context(A<String>, B) var <!REDECLARATION!>p<!>: Int<!>
+<!MUST_BE_INITIALIZED!>context(A<String>, B) var p: Int<!>
     get() {
         this@A.a.length
         this@B.b
@@ -18,7 +18,7 @@ class C(val c: Any)
         field = value
     }
 
-<!MUST_BE_INITIALIZED!>context(A<Int>, A<String>, B) var <!REDECLARATION!>p<!>: Int<!>
+<!MUST_BE_INITIALIZED!>context(A<Int>, A<String>, B) var p: Int<!>
     get() {
         this@A.a.<!UNRESOLVED_REFERENCE!>toDouble<!>()
         this@A.a.length