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.
E.g. in the following code
fun x() {}
inline fun f() { x(); g() }
inline fun g() { x(); f() }
the old implementation of inline cycle detection bailed out after
generating 3 calls of x() in each function, while the new one stops
after 2. In other words, code generation for a single function is no
longer reentered.