FIR2IR: generate specific sources for property accessors

Related to KT-60111

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitFunctionOverriddenByPropertyInTrait.fir.kt

@@ -1,8 +0,0 @@
-interface T {
-    fun getX() = 1
-}
-
-interface C : T {
-    <!ACCIDENTAL_OVERRIDE!>val x: Int
-        get() = 1<!>
-}

compiler/testData/diagnostics/testsWithJvmBackend/duplicateJvmSignature/traitImpl/traitFunctionOverriddenByPropertyInTrait.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface T {
     fun getX() = 1
 }