[Patch] Fix interval quantifier in lookahead subexpr in regex

[Tim Shen]

Forget to let _M_clone and _M_eliminate_dummy follow
_S_opcode_subexpr_lookahead, which also have _M_alt.

Is it OK not to bootstrap it ? Tested under -m64 and -m32.

Thanks!


-- 
Tim Shen

a.patch
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