8233529: loopTransform.cpp:2984: Error: assert(p_f->Opcode() == Op_IfFalse) failed Summary: Strengthened asserts in locate_pre_from_main() and added a check for is_main_no_pre_loop(). Reviewed-by: kvn, vlivanov

* The "ccls" indexer must be present in PATH, or configured with "ccls.launch.command" in user preferences.