Fix PR rtl-optimization/84071

[Eric Botcazou]

> Tested on SPARC64/Linux and ARM/EABI, applied on mainline and 7 branch.

As discussed in the audit trail, this beefs up the internal documentation 
about WORD_REGISTER_OPERATIONS.

Tested with 'make doc', applied on mainline and 7 branch.


2018-01-31  Eric Botcazou  <ebotcazou@adacore.com>

	PR rtl-optimization/84071
	* doc/tm.texi.in (WORD_REGISTER_OPERATIONS): Add explicit case.
	* doc/tm.texi: Regenerate.

-- 
Eric Botcazou
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