[Patch, BFD, AArch64] Fix PT_GNU_PROPERTY alignment issue

[Sudakshina Das]

Hi

If the new GNU property section was being created by the linker (this 
will happen only if none of the inputs have any GNU property section but 
the command line to the linker forces a bti with --force-bti), the 
alignment of the section and hence the program header of PT_GNU_PROPERTY 
type was not being set correctly. This patch fixes this issue.

Built and regression tested on aarch64-none-linux-gnu and added new 
tests to check the alignment.

Is this ok to commit?

Thanks
Sudi

bfd/ChangeLog:

2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* elfxx-aarch64.c (_bfd_aarch64_elf_link_setup_gnu_properties): Set
	alignment of the new gnu property section.

ld/ChangeLog:

2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* testsuite/ld-aarch64/aarch64-elf.exp: Add new tests.
	* testsuite/ld-aarch64/property-bti-pac4-a.d: New test.
	* testsuite/ld-aarch64/property-bti-pac4-b.d: New test.
	* testsuite/ld-aarch64/property-bti-pac4.s: New test.
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