[patch] Fix pr18141

[Rafael Espíndola]

The attached patch fixes pr18141 by taking the calling convention into
consideration when looking for which member is being specialized.

Without this patch clang falls of

  if (!Instantiation) {
    // There is no previous declaration that matches. Since member
    // specializations are always out-of-line, the caller will complain about
    // this mismatch later.
    return false;
  }

But nothing complains, so there might be something else wrong in here.

Cheers,
Rafael
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