[PATCH][AArch64][gas] Set the minimum alignment on code segments.

[Matthew Wahab]

On AArch64, gas doesn't set the minimum alignment for code segments 
making it possible for a segment to become misaligned during a link. It 
is also inconsistent with the ABI (4.3.5: Section Alignment).

This patch sets the minimum alignment for a section to 4 bytes, if the 
section contains an instruction.

A similar issue in the ARM backend has already been fixed 
(https://sourceware.org/bugzilla/show_bug.cgi?id=12931).

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

Ok for trunk?
Matthew

gas/
2015-03-05  Matthew Wahab  <matthew.wahab@arm.com>

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


gas/testsuite
2015-03-05  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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