JVM IR: rename private fields for properties with same name

This is needed to get rid of the code that appends "$companion" to
properties moved from companion, because it caused inconsistencies in
the ABI and in JVM signatures stored in the metadata

compiler/testData/codegen/box/fieldRename/jvmFieldNoClash1.kt

@@ -0,0 +1,23 @@
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+// In the old JVM backend, FieldOwnerContext is sensitive to the order of properties which it invents name for. Companion object properties
+// are usually the first, so A.Companion.x here gets the name "x". After that it tries to invent a new name for A.x but fails because
+// @JvmField-annotated properties cannot be renamed, which leads to a JVM declaration clash error.
+// IGNORE_BACKEND: JVM
+
+class A {
+    @JvmField
+    val x = "outer"
+
+    companion object {
+        val x = "companion"
+    }
+}
+
+fun box(): String {
+    if (A().x != "outer") return "Fail outer"
+    if (A.x != "companion") return "Fail companion"
+
+    return "OK"
+}