[Aarch64][gas][2.25] Backport fix for minimum code section alignment

[Matthew Wahab]

Hello,

This patch backports to binutils-2.25 the fix for failing to set a minimum
alignment for code-sections.

The trunk change is here:
   https://sourceware.org/ml/binutils/2015-03/msg00039.html
The commit log is here:
   https://sourceware.org/ml/binutils-cvs/2015-03/msg00054.html

Tested aarch64-none-linux-gnu with check-binutils and check-gas.

Ok for the branch?
Matthew

gas/
2015-06-03  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-aarch64.c (mapping_state): Set minimum alignment for
	code sections.


gas/testsuite
2015-06-03  Matthew Wahab  <matthew.wahab@arm.com>

	* gas/aarch64/codealign.d: Add test for code section alignment.
	* gas/aarch64/codealign.s: New file.
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