sysprof: add_proto call in the default mode

[mkokryashkin]

Bug description
Function prototype allocation during the sysprof runtime in the default mode leads to SIGABRT.

• OS: Linux
• OS Version: Manjaro, Kernel 5.10.114-1
• Architecture: amd64

Tarantool 2.11.0-entrypoint-114-gbb792631c
Target: Linux-x86_64-Debug
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_BACKTRACE=ON
Compiler: /usr/bin/cc /usr/bin/c++
C_FLAGS: -fexceptions -funwind-tables -fno-common -fopenmp -msse2 -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-gnu-alignof-expression -fno-gnu89-inline -Wno-cast-function-type -Werror
CXX_FLAGS: -fexceptions -funwind-tables -fno-common -fopenmp -msse2 -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Wno-cast-function-type -Werror

Steps to reproduce

Run this script:

jit.off()

local res, err = misc.sysprof.start({mode="D"})
assert(res, err)

local chunk = [[
function lua_global_f()
  local a = 'teststring'
end
]]

local f, err = loadstring(chunk)
assert(f, err)
f()
lua_global_f()

collectgarbage()

local res, err = misc.sysprof.stop()
assert(res, err)

as tarantool script.lua

Actual behavior
tarantool: /home/maxim/Programming/tarantool/third_party/luajit/src/lj_wbuf.c:55: wbuf_reserve: Assertion `n <= buf->size' failed.
[1] 407642 IOT instruction (core dumped) ./src/tarantool

**Expected behavior**
Correct execution with no side effects.