FIR IDE: use FirCaches in JavaSymbolProvider

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/providers/SymbolProviderCache.kt

@@ -29,23 +29,6 @@ inline class SymbolProviderCache<K, V : Any> @PrivateForInline constructor(@Priv
         }
     }
 
-    @OptIn(PrivateForInline::class)
-    inline fun <T> lookupCacheOrCalculateWithPostCompute(
-        key: K, crossinline l: (K) -> Pair<V?, T>, postCompute: (V, T) -> Unit
-    ): V? {
-        @Suppress("UNCHECKED_CAST")
-        return when (val value = cache[key]) {
-            null -> {
-                val calculated = l(key)
-                cache[key] = calculated.first ?: NullValue
-                calculated.first?.let { postCompute(it, calculated.second) }
-                calculated.first
-            }
-            NullValue -> null
-            else -> value as V
-        }
-    }
-
     @OptIn(PrivateForInline::class)
     operator fun contains(key: K): Boolean = key in cache