[commit:d10v] Tweak prolog analyzer

[Andrew Cagney]

Hello,

This patch tweaks the d10v prologue analyzer so that it can spot the 
sequence:

	sp--
	move sp to fp
	store rN at [fp]

and hence identify the address at which rN was saved.  It has no effect 
on the quality of the d10v's test results.

Andrew
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