[FIR IDE] Rethrow IndexNotReadyException from KtFirReferenceResolver

Resolve can be called even when the indices are not ready. In such cases
the `IndexNotReadyException` can be intentionally ignored by the
platform code

To make our code play nice with the platform, from now on we do not
wrap `IndexNotReadyException` into another exception - instead we
just let it fly and be ignored by the platform. If the platform
doesn't choose to ignore it, then it will be showed as an error
as usual

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/references/KtFirReferenceResolver.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.idea.references
 
 import com.intellij.openapi.diagnostic.ControlFlowException
+import com.intellij.openapi.project.IndexNotReadyException
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiElementResolveResult
 import com.intellij.psi.ResolveResult
@@ -26,7 +27,8 @@ object KtFirReferenceResolver : ResolveCache.PolyVariantResolver<KtReference> {
             val resolveToPsiElements = try {
                 analyse(ref.expression) { ref.getResolvedToPsi(this) }
             } catch (e: Throwable) {
-                if (e is ControlFlowException) throw e
+                if (e is ControlFlowException || e is IndexNotReadyException) throw e
+
                 throw KtReferenceResolveException(ref, e)
             }
             resolveToPsiElements.map { KotlinResolveResult(it) }.toTypedArray()