Blackfin: Use local symbols for hardware loops in gas

[Bernd Schmidt]

The Blackfin assembler knows two pseudo instructions, LOOP_BEGIN and 
LOOP_END, which get expanded to a real LSETUP instruction with two 
labels as argument.  This patch ensures that the labels we create aren't 
visible globally.  Like the others in this series this change is by Jie 
Zhang.


Bernd
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