[SH][committed] Fix PR 61996

[Oleg Endo]

Hi,

The attached patch fixes PR 61996 and does some minor documentation
fixes.  Committed to trunk (r214406), 4.9 (r214407) and 4.8 (r214408).
Tested with 'make all', verifying that the new test case passes for m1*
and m2* targets and with 'make info dvi pdf'.

Cheers,
Oleg

gcc/ChangeLog:
	PR target/61996
	* config/sh/sh.opt (musermode): Allow negative form.
	* config/sh/sh.c (sh_option_override): Disable TARGET_USERMODE for
	targets that don't support it.
	* doc/invoke.texi (SH Options): Rename sh-*-linux* to sh*-*-linux*.
	Document -mno-usermode option.

gcc/testsuite/ChangeLog:
	PR target/61996
	* gcc.target/sh/pr61996.c: New.
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