Fix magic number in arm-tdep.c

[Michael Snyder]

Ulrich Weigand wrote:
> Yao Qi wrote:
> 
>> 	* gdb/arm-tdep.c (shifted_reg_val): Replace magic number 15 with
>> 	ARM_PC_REGNUM.
>> 	(thumb_get_next_pc_raw, arm_get_next_pc_raw): Likewise.
>> 	(displaced_write_reg, displaced_read_reg): Likewise.
>> 	(copy_ldr_str_ldrb_strb, cleanup_block_load_all): Likewise.
>> 	(cleanup_block_load_pc, copy_block_xfer): Likewise.
>> 	(cleanup_branch): Replace magic number 14 and 15 with
>> 	ARM_LR_REGNUM and ARM_PC_REGNUM respectively.
> 
> This is OK, but please keep the indentation in cases like:
> 
>> -		nextpc = (rn == 15) ? pc_val + 8
>> +		nextpc = (rn == ARM_PC_REGNUM) ? pc_val + 8
>>  				    : get_frame_register_unsigned (frame, rn);
> 
> (? and : should remain in the same column).
> 

I don't agree - : is an operator and should be indented by just two 
spaces.  As emacs does by default.