tests/lapi: add sysprof test The patch adds test for sysprof built into LuaJIT.

tests/capi: speedup luaL_loadbuffer_proto_test The patch removes debug hook and testing using bytecode in luaL_loadbuffer_proto_test. Debug hook was added in the commit c772887631f6 ("tests: enable debug hook in luaL_loadbuffer_proto"), the hook slows down execution, breaks JIT compilation in LuaJIT and there were no bugs found with it. Testing with bytecode has been added the commit 0b8c9b8a44d2 ("tests: execute bytecode in luaL_loadbuffer_proto_test"), it slows down running each chunk in two times and there were no bugs found by added function.