Rename tests with diagnostics on JVM backend

Remove the "_ir" suffix. It was originally used to distinguish tests on
the JVM IR backend from the old JVM backend ("_old"), but the latter are
removed now.

compiler/testData/diagnostics/testsWithJvmBackend/suspendInlineCycle.kt

@@ -0,0 +1,12 @@
+// FIR_IDENTICAL
+// !RENDER_DIAGNOSTICS_FULL_TEXT
+// TARGET_BACKEND: JVM_IR
+suspend inline fun inlineFun1(p: () -> Unit) {
+    p()
+    <!INLINE_CALL_CYCLE!>inlineFun2(p)<!>
+}
+
+suspend inline fun inlineFun2(p: () -> Unit) {
+    p()
+    <!INLINE_CALL_CYCLE!>inlineFun1(p)<!>
+}