[PATCH, binutils/ARM] Remove legacy basepri_mask MRS/MSR special reg

[Thomas Preudhomme]

Hi,

When support for Cortex-M was originally added, a mistake was made in the 
assembler and BASEPRI_MASK was used as an MRS/MSR special register instead of 
the correct BASEPRI_MAX. This was back in 2010/11 timeframe. The code was fixed 
fairly quickly but the incorrect name was left in place. I think it is now time 
for the incorrect name to be dropped.

ChangeLog entry is as follows:

*** gas/ChangeLog ***

2016-09-12  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * config/tc-arm.c (v7m_psrs): Remove BASEPRI_MASK MRS/MSR special
         register and redundant basepri_max.


Is this ok for trunk?

Best regards,

Thomas
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