PATCH [2/4] arm: Add Tag_BTI_extension build attribute

[Nick Clifton]

Hi Andrea,

> second patch of the series adding 'Tag_BTI_extension' build attribute
> support.
> 
> Here follows its semantic:
> 
>    0 The user did not permit this entity to use BTI instructions
>    1 The user permitted this entity to use BTI instructions in the NOP space
>    2 The user permitted this entity to use BTI instructions in the NOP and in the non-NOP space

Approved - please apply.

(I am not sure if I have already approved patch 1/4 as I cannot
find it in my email queue, but if I have not, then please consider
it approved as well).

Cheers
   Nick