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/testData/codegen/box/multiplatform/expectClassInJvmMultifileFacade.kt

@@ -1,5 +1,6 @@
 // !LANGUAGE: +MultiPlatformProjects
 // TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // FILE: common.kt
 

compiler/testData/codegen/box/multiplatform/optionalExpectation.kt

@@ -1,6 +1,7 @@
 // !LANGUAGE: +MultiPlatformProjects
 // !USE_EXPERIMENTAL: kotlin.ExperimentalMultiplatform
 // IGNORE_BACKEND: NATIVE
+// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 // MODULE: library
 // FILE: expected.kt