FIR: fix atomic qualified acess sharing the same PSI with callee ref

Consider an atomic reference `i`, it's FIR representation is

- FirQualifiedAccessExpression
  - calleeReference : FirNamedReference

Currently, both of the above FIR elements uses the same PSI element as
the source. Such problems are not present with `this` or `super` because
we manually mark them as `ExplicitThisOrSuperReference`.

This change generalizes the previous `ExplicitThisOrSuperReference` as
`ReferenceInAtomicQualifiedAccess` and fixes it for more cases.

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/frontend/fir/handlers/FirDiagnosticsHandler.kt

@@ -52,6 +52,7 @@ class FirDiagnosticsHandler(testServices: TestServices) : FirAnalysisHandler(tes
         private val allowedKindsForDebugInfo = setOf(
             FirRealSourceElementKind,
             FirFakeSourceElementKind.DesugaredCompoundAssignment,
+            FirFakeSourceElementKind.ReferenceInAtomicQualifiedAccess,
         )
     }