[SH, committed] Fix iterators conversion oversight

[Oleg Endo]

Hello,

My last change that converted some of the SH patterns to use iterators
introduced a problem on SH2A, where I missed to pass '<MODE>mode'
instead of 'QImode' in one of the patterns.
Committed as obvious.

Cheers,
Oleg


ChangeLog:

	* config/sh/sh.md (*extend<mode>si2_compact_mem_disp): Pass
	iterated mode to sh_legitimate_index_p instead of QImode.

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