IR text tests: Unmute tests that have main function

Don't use `main` function in these tests, because `main` function
has specific mangling rules in JVM. Use other function name.

^KT-57755

compiler/testData/ir/irText/firProblems/localCompanion.kt.txt

@@ -1,4 +1,4 @@
-fun main() {
+fun runMe() {
   local class Foo {
     constructor() /* primary */ {
       super/*Any*/()