Renderer doesn't escape/quote symbols when it should

[yglukhov]

import macros

macro dumpRepr(u: typed) =
  echo repr u

template decl(a: untyped) =
  proc `a @ procName`(`a @ param`: int) = discard

dumpRepr:
  decl(hi)

Actual output:

proc hi@procName(a@param`gensym0: int) =
  discard

Expected output:

proc `hi@procName`(`a@param'`'gensym0`: int) =
  discard

$ nim -v
Nim Compiler Version 1.7.1 [Linux: amd64]
Compiled at 2022-04-19
Copyright (c) 2006-2022 by Andreas Rumpf

git hash: dc4cc2dca53e3772efb3654a4ddbbe8350d1db43
active boot switches: -d:release

I've briefly looked at the renderer, and it only seems to check the first character of the name to see if it should be quoted or not - https://github.com/nim-lang/Nim/blob/devel/compiler/renderer.nim#L971

It's possible to change this to check the whole string, not just the first character, although I'm not sure if it's the right approach.

[metagn]

This should not have a Codegen label