[ARM] pass "--be8" to linker when linking for M profile

[Bin Cheng]

Hi,
The linker should do endian swizzling at link-time according to "--be8"
option.
This patch modifies BE8_LINK_SPEC by adding cortex-m processors in the specs
string.

Since R-profile supports configurable big-endian instruction fetch, I didn't
include it here.

Is it ok? Thanks.

2011-09-15  Cheng Bin <bin.cheng@arm.com>
                * config/arm/bpabi.h (BE8_LINK_SPEC): add cortex-m arch and
processors.

Thanks-chengbin
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