JVM_IR: cast argument of enumValueOf to String in bytecode

Generic functions and implicit casts may return a supertype instead.

 #KT-45865 Fixed

compiler/testData/codegen/box/enum/enumValueOf.kt

@@ -0,0 +1,6 @@
+// IGNORE_BACKEND: WASM
+enum class E { OK }
+
+fun <T> id(x: T) = x
+
+fun box() = enumValueOf<E>(id("OK")).name