[commit] frame_extra_info_zalloc()

[Andrew Cagney]

Hello,

The attached adds the method:
	struct frame_extra_info *
	frame_extra_info_zalloc(fi, sizeof extra info)
to frame.[hc].  It makes it possible for non-frame code to initialize 
the extra info field.

I should note that I also experimented with modifying 
INIT_EXTRA_FRAME_INFO so that it returned the initialized extra info 
(instead of directly setting it).  I found, though, that tdep files do 
strange things such as initializing extra info in strange places. 
Hence, I think this method is easier.

A follow-up patch will modify the init extra info code so that it uses it.

committed,
Andrew
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