Add method to evaluate constant expressions in ir module for fir2ir

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlin.fir.backend.generators.AnnotationGenerator
 import org.jetbrains.kotlin.fir.backend.generators.CallAndReferenceGenerator
 import org.jetbrains.kotlin.fir.backend.generators.FakeOverrideGenerator
 import org.jetbrains.kotlin.fir.backend.evaluate.IrConstTransformer
+import org.jetbrains.kotlin.fir.backend.evaluate.evaluateConstants
 import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.descriptors.FirModuleDescriptor
 import org.jetbrains.kotlin.fir.psi
@@ -241,9 +242,7 @@ class Fir2IrConverter(
                 descriptor.owner.parent = parentClass ?: continue
             }
 
-            irModuleFragment.files.forEach {
-                it.transformChildren(IrConstTransformer(irModuleFragment), null)
-            }
+            evaluateConstants(irModuleFragment)
 
             return Fir2IrResult(irModuleFragment, symbolTable, sourceManager, components)
         }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/evaluate/IrConstTransformer.kt

@@ -23,6 +23,10 @@ import org.jetbrains.kotlin.ir.types.isArray
 import org.jetbrains.kotlin.ir.types.typeOrNull
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 
+fun evaluateConstants(irModuleFragment: IrModuleFragment) {
+    irModuleFragment.files.forEach { it.transformChildren(IrConstTransformer(irModuleFragment), null) }
+}
+
 //TODO create abstract class that will be common for this and lowering
 class IrConstTransformer(irModuleFragment: IrModuleFragment) : IrElementTransformerVoid() {
     private val interpreter = IrInterpreter(irModuleFragment)