[PATCH] libstdc++: Don't use reserved identifiers in simd headers

[Rainer Orth]

Two simd tests FAIL on Solaris, both SPARC and x86:

FAIL: experimental/simd/standard_abi_usable.cc -msse2 -O2 -Wno-psabi (test for excess errors)
FAIL: experimental/simd/standard_abi_usable_2.cc -msse2 -O2 -Wno-psabi (test for excess errors)

This happens because the simd headers use identifiers documented in the
libstdc++ manual as reserved by system headers.

Fixed as follows, tested on i386-pc-solaris2.11, sparc-sun-solaris2.11,
and x86_64-pc-linux-gnu.

Ok for master?

As an aside, the use of vim: markers initially confused the hell out of
me.  As an Emacs user, I rarely use vi for much more than a pager, but
when I wanted to check the lines mentioned in the g++ errors, I had no
idea what was going on or how to disable the folding enabled there:

// vim: foldmethod=marker sw=2 noet ts=8 sts=2 tw=80

I can't help but feel that this is just a personal preference and
doesn't belong into the upstream code.

For avoidance of doubt, I'd consider equivalent Emacs local variables
equally inappropriate.

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


2021-02-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libstdc++-v3:
	* include/experimental/bits/simd.h: Replace reserved _X, _B by
	_Xp, _Bp.
	* include/experimental/bits/simd_builtin.h: Likewise.
	* include/experimental/bits/simd_x86.h: Likewise.

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