K2: add ACCIDENTAL_OVERRIDE_CLASH_BY_JVM_SIGNATURE for clashing functions

This diagnostic is reported on an explicitly-declared function which
overrides a regular Java function with the same signature as a hidden
one from the same scope.

#KT-64846 Fixed

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJvmDiagnosticsList.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.psi.KtAnnotationEntry
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.psi.KtElement
 import org.jetbrains.kotlin.psi.KtExpression
+import org.jetbrains.kotlin.psi.KtNamedFunction
 import org.jetbrains.kotlin.util.PrivateForInline
 
 @Suppress("ClassName", "unused")
@@ -45,6 +46,12 @@ object JVM_DIAGNOSTICS_LIST : DiagnosticList("FirJvmErrors") {
             parameter<FirCallableSymbol<*>>("override")
             parameter<FirCallableSymbol<*>>("base")
         }
+
+        val ACCIDENTAL_OVERRIDE_CLASH_BY_JVM_SIGNATURE by error<KtNamedFunction>(PositioningStrategy.DECLARATION_NAME) {
+            parameter<FirNamedFunctionSymbol>("hidden")
+            parameter<String>("overrideDescription")
+            parameter<FirNamedFunctionSymbol>("regular")
+        }
     }
 
     val TYPES by object : DiagnosticGroup("Types") {