[BUG] Some recursive macro with cole=2 and lazyredraw produces E315 error

[ZyX]

Consider the following script:

    vim -u <(echo 'set rtp= lazyredraw conceallevel=2') \
        --cmd 'call setline(".", range(1, 3))'  \
        -s <(echo -n $'jqaqqadd@aq@a')

It will produce a E315 error while it should go into infinite loop. Note that 
if 
syntax highlighting is on, then it is removed if you stop infinite loop with
<C-c>. Tested on vim-7.3.102 from Gentoo repos and vim-7.3.119 (mercurial 
revision 77f3dd990b12).

// setting rtp to empty is not relevant here, it is just to prevent loading any
// plugins.

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