Add tests for JVM backend diagnostics with K2 light tree

In the vast majority of tests, diagnostics are reported at a slightly
different location in LT vs PSI. This is because in the light tree mode,
backend errors are reported basically on the start of the IR element,
which is for example the keyword "class" for a class and not its name as
in K1 or in K2+PSI. Similarly, the end of the diagnostic is at the
ending offset of the IR element.

Normally it would be a bit user-unfriendly to highlight the whole class
as red, starting from the keyword "class" and ending with the closing
brace "}". But remember that these are backend diagnostics in the K2+LT
mode, which is only possible in the compiler scenario, not in the IDE.
And in this case, the ending offset doesn't matter at all because it's
not presented to the user, and minor change in the starting offset is
not a problem as well.

There are some tests which legitimately fail in the LT mode because the
corresponding diagnostics haven't been supported. They will be dealt
with in subsequent commits:

  testPropertyInlineCycle
  testInlineCycle
  MultifileClasses.testJvmSynthetic
  testSuspendInlineCycle
  testIndirectInlineCycle

 #KT-59586

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/backend/handlers/JvmBackendDiagnosticsHandler.kt

@@ -15,7 +15,10 @@ import org.jetbrains.kotlin.diagnostics.impl.BaseDiagnosticsCollector
 import org.jetbrains.kotlin.diagnostics.rendering.DefaultErrorMessages
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.jvm.diagnostics.KtDefaultJvmErrorMessages
+import org.jetbrains.kotlin.test.FirParser
 import org.jetbrains.kotlin.test.directives.DiagnosticsDirectives
+import org.jetbrains.kotlin.test.directives.FirDiagnosticsDirectives
+import org.jetbrains.kotlin.test.directives.model.singleOrZeroValue
 import org.jetbrains.kotlin.test.frontend.classic.handlers.ClassicDiagnosticReporter
 import org.jetbrains.kotlin.test.frontend.classic.handlers.withNewInferenceModeEnabled
 import org.jetbrains.kotlin.test.frontend.fir.handlers.FirDiagnosticCodeMetaInfo
@@ -57,11 +60,13 @@ class JvmBackendDiagnosticsHandler(testServices: TestServices) : JvmBinaryArtifa
     private fun reportKtDiagnostics(module: TestModule, info: BinaryArtifacts.Jvm) {
         val ktDiagnosticReporter = info.classFileFactory.generationState.diagnosticReporter as BaseDiagnosticsCollector
         val globalMetadataInfoHandler = testServices.globalMetadataInfoHandler
+        val firParser = module.directives.singleOrZeroValue(FirDiagnosticsDirectives.FIR_PARSER)
+        val lightTreeComparingModeEnabled = firParser != null && FirDiagnosticsDirectives.COMPARE_WITH_LIGHT_TREE in module.directives
+        val lightTreeEnabled = firParser == FirParser.LightTree
         for (testFile in module.files) {
             val ktDiagnostics = ktDiagnosticReporter.diagnosticsByFilePath["/${testFile.name}"] ?: continue
             ktDiagnostics.forEach {
-                val metaInfos =
-                    it.toMetaInfos(module, testFile, globalMetadataInfoHandler, false, false)
+                val metaInfos = it.toMetaInfos(module, testFile, globalMetadataInfoHandler, lightTreeEnabled, lightTreeComparingModeEnabled)
                 globalMetadataInfoHandler.addMetadataInfosForFile(testFile, metaInfos)
             }
         }

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/runners/AbstractDiagnosticsTestWithJvmBackend.kt

@@ -29,6 +29,7 @@ import org.jetbrains.kotlin.test.frontend.fir.Fir2IrJvmResultsConverter
 import org.jetbrains.kotlin.test.frontend.fir.FirFrontendFacade
 import org.jetbrains.kotlin.test.frontend.fir.FirOutputArtifact
 import org.jetbrains.kotlin.test.frontend.fir.handlers.FirDiagnosticsHandler
+import org.jetbrains.kotlin.test.frontend.fir.handlers.PsiLightTreeMetaInfoProcessor
 import org.jetbrains.kotlin.test.model.*
 import org.jetbrains.kotlin.test.services.configuration.CommonEnvironmentConfigurator
 import org.jetbrains.kotlin.test.services.configuration.JvmEnvironmentConfigurator
@@ -63,6 +64,7 @@ abstract class AbstractDiagnosticsTestWithJvmBackend<R : ResultingArtifact.Front
         )
 
         useMetaInfoProcessors(::OldNewInferenceMetaInfoProcessor)
+
         useAdditionalSourceProviders(
             ::AdditionalDiagnosticsSourceFilesProvider,
             ::CoroutineHelpersSourceFilesProvider,
@@ -77,6 +79,7 @@ abstract class AbstractDiagnosticsTestWithJvmBackend<R : ResultingArtifact.Front
                 )
             }
         } else {
+            useMetaInfoProcessors(::PsiLightTreeMetaInfoProcessor)
             firHandlersStep {
                 useHandlers(::FirDiagnosticsHandler)
             }
@@ -132,3 +135,5 @@ abstract class AbstractFirDiagnosticsTestWithJvmIrBackendBase(
 }
 
 abstract class AbstractFirPsiDiagnosticsTestWithJvmIrBackend : AbstractFirDiagnosticsTestWithJvmIrBackendBase(FirParser.Psi)
+
+abstract class AbstractFirLightTreeDiagnosticsTestWithJvmIrBackend : AbstractFirDiagnosticsTestWithJvmIrBackendBase(FirParser.LightTree)