JVM IR: add -Xir-check-local-names to check names for consistency

Since KotlinTypeMapper is no longer used in the JVM IR backend, we need
not run CodegenBinding.initTrace and check that names of local entities
are exactly equal to local names computed by that algorithm.

However, it's still useful as an opt-in flag, to discover issues where
unwanted elements take part in the naming (such as temporary IR
variables, see for example cb2e68fece). So we introduce a new command
line argument -Xir-check-local-names which, when the IR backend is used
(via -Xuse-ir), launches the name computation algorithm from the old
backend and then compares that the names are exactly equal to the names
computed by the IR backend in InventNamesForLocalClasses.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -75,6 +75,12 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xuse-ir", description = "Use the IR backend")
     var useIR: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xir-check-local-names",
+        description = "Check that names of local classes and anonymous objects are the same in the IR backend as in the old backend"
+    )
+    var irCheckLocalNames: Boolean by FreezableVar(false)
+
     @Argument(value = "-Xmodule-path", valueDescription = "<path>", description = "Paths where to find Java 9+ modules")
     var javaModulePath: String? by NullableStringFreezableVar(null)
 
@@ -298,6 +304,7 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
         result[JvmAnalysisFlags.inheritMultifileParts] = inheritMultifileParts
         result[JvmAnalysisFlags.sanitizeParentheses] = sanitizeParentheses
         result[JvmAnalysisFlags.suppressMissingBuiltinsError] = suppressMissingBuiltinsError
+        result[JvmAnalysisFlags.irCheckLocalNames] = irCheckLocalNames
         return result
     }