[PATCH 7/8] DWARF: add a language hook for scalar biased types

[Pierre-Marie de Rodat]

On 07/16/2015 10:48 AM, Pierre-Marie de Rodat wrote:
> Front-ends like GNAT for Ada sometimes use biased encodings for integral
> types.  This change creates a new language hook so that the bias
> information can make it into the debugging information back-end and
> introduces an experimental DWARF attribute to hold it.

Here's an updated, only to fix the conflict with the include/dwarf2.def 
update that occurred here: 
<https://gcc.gnu.org/ml/gcc-patches/2015-08/msg00771.html>.

Bootstrapped and regtested on x86_64-linux.

-- 
Pierre-Marie de Rodat
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