Use class name instead internal name in coroutines debug metadata

I.e. instead of slashes use dots in fqnames.

 #KT-28237 Fixed

compiler/testData/codegen/box/coroutines/debug/fqName.kt

@@ -0,0 +1,41 @@
+// !LANGUAGE: +ReleaseCoroutines
+
+// IGNORE_BACKEND: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+// FULL_JDK
+// WITH_COROUTINES
+
+@file:Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER", "CANNOT_OVERRIDE_INVISIBLE_MEMBER")
+
+package some.long.name
+
+import helpers.*
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+import kotlin.coroutines.jvm.internal.*
+
+suspend fun dummy() {}
+
+class Test {
+    suspend fun getStackTraceElement(): StackTraceElement {
+        dummy() // to force state-machine generation
+        return suspendCoroutineUninterceptedOrReturn<StackTraceElement> {
+            (it as BaseContinuationImpl).getStackTraceElement()
+        }
+    }
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+fun box(): String {
+    var res = "OK"
+    builder {
+        if (Test().getStackTraceElement().className != "some.long.name.Test") {
+            res = Test().getStackTraceElement().className
+        }
+    }
+    return res
+}