[RFA] Reenable mov lowreg, lowreg for Thumb when no -mcpu specified on command line.

[Matthew Gretton-Dann]

All,

The recent change to disallow mov lowreg, lowreg in Thumb pre-v6 
unfortunately stopped the assembler accepting this form of mov when no 
CPU had been specified on the command-line.  This was noticed as the 
testsuite test "Invalid SP and PC operands test - THUMB" started failing.

The attached patch fixes this and also ensures we note we have used a v6 
feature so that the output attributes are set correctly in this case.

This was tested arm-none-eabi.

Can someone please review?

Original patch which introduced the failure here:
   http://sourceware.org/ml/binutils/2011-11/msg00171.html

Thanks,

Matt

gas/ChangeLog:

2011-11-24  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

         * gas/config/tc-arm.c (do_t_mov_cmp): Allow MOV lowreg, lowreg
         when no CPU is specified.

gas/testsuite/ChangeLog:

2011-11-24  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>

         * gas/arm/mov-highregs-any.d: New testcase.
         * gas/arm/mov-highregs-any.s: Likewise.
         * gas/arm/mov-lowregs-any.d: Likewise.
         * gas/arm/mov-lowregs-any.s: Likewise.

-- 
Matthew Gretton-Dann
Principal Engineer, PD Software - Tools, ARM Ltd
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