Support for init_priority in ARM EABI configurations

[Mark Mitchell]

Paul, Richard --

The csl-arm-branch (and, probably, mainline) claim not to support the
init_priority attribute for AAPCS targets.  (I can't remember who did
that; quite possibly me!)

One of our customers has suggested that this is a mistake, and I tend to
agree.  I think the reason this isn't supported is that it's not
portable, in the sense that EABI-compliant linkers need not support
initialization priorities, and will probably (silently!) fail to run the
prioritized code.  However, on a fully-GNU system, it seems like a
needless restriction.  Therefore, I think we should allow the use of the
attribute.  Thoughts?

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304