[LL API] Check raw expect/actual modifiers in PSI-FIR comparison

There might be both common and JVM artifacts of the same library
in dependencies.

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/KtDeclarationAndFirDeclarationEqualityChecker.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.analysis.low.level.api.fir.api
 import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.analysis.low.level.api.fir.sessions.createEmptySession
 import org.jetbrains.kotlin.analysis.low.level.api.fir.util.errorWithFirSpecificEntries
+import org.jetbrains.kotlin.analysis.utils.printer.parentsOfType
 import org.jetbrains.kotlin.builtins.StandardNames
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.builder.BodyBuildingMode
@@ -24,14 +25,18 @@ import org.jetbrains.kotlin.fir.types.impl.FirImplicitNullableAnyTypeRef
 import org.jetbrains.kotlin.name.StandardClassIds
 import org.jetbrains.kotlin.psi.KtCallableDeclaration
 import org.jetbrains.kotlin.psi.KtConstructor
+import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.psi.KtFunction
 import org.jetbrains.kotlin.psi.KtTypeReference
+import org.jetbrains.kotlin.psi.psiUtil.hasActualModifier
+import org.jetbrains.kotlin.psi.psiUtil.hasExpectModifier
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.utils.addIfNotNull
 
 // TODO replace with structural type comparison?
 object KtDeclarationAndFirDeclarationEqualityChecker {
     fun representsTheSameDeclaration(psi: KtCallableDeclaration, fir: FirCallableDeclaration): Boolean {
+        if (!modifiersMatch(psi, fir)) return false
         if (!receiverTypeMatch(psi, fir)) return false
         if (!returnTypesMatch(psi, fir)) return false
         if (!typeParametersMatch(psi, fir)) return false
@@ -39,6 +44,13 @@ object KtDeclarationAndFirDeclarationEqualityChecker {
         return true
     }
 
+    private fun modifiersMatch(psi: KtCallableDeclaration, fir: FirCallableDeclaration): Boolean {
+        // According to asymmetric logic in 'RawFirBuilder'
+        if (psi.parentsOfType<KtDeclaration>().any { it.hasExpectModifier() } != fir.symbol.rawStatus.isExpect) return false
+        if (psi.hasActualModifier() != fir.symbol.rawStatus.isActual) return false
+        return true
+    }
+
     private fun receiverTypeMatch(psi: KtCallableDeclaration, fir: FirCallableDeclaration): Boolean {
         if ((fir.receiverParameter != null) != (psi.receiverTypeReference != null)) return false
         if (fir.receiverParameter != null && !isTheSameTypes(psi.receiverTypeReference!!, fir.receiverParameter!!.typeRef, isVararg = false)) {