[Patch][binutils] Generic support for parsing numbers in bfloat16 format [5/X]

Hi,

This patch is part of a series that adds support for Armv8.6-A
(Matrix Multiply and BFloat16 extensions).

This patch contains some general refactoring of the atof_ieee
function, exposing a function that allows a higher level of control
over the format of IEEE-like floating point numbers.
This has been done in order to be able to add a directive for assembling
floating point literals in the bfloat16 format in the following patches.

Committed on behalf of Mihail Ionescu.

Tested on arm-none-eabi, arm-none-linux-gnueabihf, aarch64-none-elf
and aarch64-none-linux-gnuwith no issues.

gas/ChangeLog:

2019-10-21  Mihail Ionescu  <mihail.ionescu@arm.com>
2019-10-21  Barnaby Wilks  <barnaby.wilks@arm.com>

	* as.h (atof_ieee_detail): Add prototype for atof_ieee_detail function.
	(atof_ieee): Move some code into the atof_ieee_detail function.
	(atof_ieee_detail): Add function that provides a higher level of control over generating
	IEEE-like numbers.

Is it ok for trunk?

Regards,
Mihail

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