Report JVM signature clashes from JVM_IR

Also:

* Do not rename public ABI fields
This includes backing fields for const, lateinit, @JvmField properties,
and instance fields for objects.

* FAKE_OVERRIDE declarations for static members of parent Java classes
Required to report cases when a Kotlin function accidentally overrides
Java class member.

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTestWithJvmBackend.kt

@@ -49,6 +49,9 @@ abstract class AbstractDiagnosticsTestWithJvmBackend : AbstractDiagnosticsTest()
         return analysisResult
     }
 
+    // DO NOT use FE-based diagnostics for JVM signature conflict
+    override fun shouldSkipJvmSignatureDiagnostics(groupedByModule: Map<TestModule?, List<TestFile>>): Boolean = true
+
     protected abstract fun GenerationState.Builder.setupGenerationState(): GenerationState.Builder
 }
 

compiler/tests-common/tests/org/jetbrains/kotlin/test/TargetBackend.kt

@@ -11,6 +11,7 @@ enum class TargetBackend(
 ) {
     ANY(false),
     JVM(false),
+    JVM_OLD(false, JVM),
     JVM_IR(true, JVM),
     JS(false),
     JS_IR(true, JS),