[PATCH][doc] Document clrsb optab and fix some inconsistencies

[Kyrill Tkachov]

Hi all,

I noticed we don't document the clrsb<mode>2 optab but it does exist. 
The proposed description is based on the clrsb RTL code documentation in 
rtl.texi.
While we're at it, clean up the wording for some other cases in the file 
which refer to an argument 'x' when they mean to refer to operand 1. 
They were probably copied over from rtl.texi which does use 'x'.

Ok for trunk?

2014-07-16  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * doc/md.texi (clrsb): Document.
     (clz): Change reference to x into operand 1.
     (ctz): Likewise.
     (popcount): Likewise.
     (parity): Likewise.
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