IA64: dependency violation reported where there is none

[Jan Beulich]

The assembler may detect a dependency violation (namely in code produced by 
gcc) when there is none because the removal of mutex relations is too strict. 
When a predicated compare of 'non-special' type targets the same (or a subset) 
pair of predicates that already enjoy a mutex relationship, than this relation 
is not altered and should hence not be removed. A suggested fix (based on the 
original 2.13 binutils sources) is attached.

Thanks, Jan

tc-ia64.c
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