[arm] improve assembler error

[Nathan Sidwell]

This patch improves an assembler error when an unfixupable reloc is used. 
Rather than say '<unknown reloc>'  We mention the T32_OFFSET_IMM relocation by name.

tested on arm-eabi, ok?

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

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