[ARM] use architectural nops

Nathan Sidwell nathan@codesourcery.com
Tue Mar 31 13:45:00 GMT 2009
This patch changes arm's code alignment to use architectural nop instructions, 
when available.  For thumb2 we generate 4 byte nops when possible, rather than 
pairs of 2-byte nops.

tested for arm-eabi.

ok?

nathan

-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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