[PATCH 6/8][Binutils][AArch64] Close sequences at the end of sections

[Tamar Christina]

Hi All,

Any open sequence at the end of a section or assembly is considered an error.
This patch adds a check at the end to ensure that all sequences have been closed
and if not reports a warning.

During disassembly it's not possible to detect this condition in the back-end so
the warning is only emitted from the assembler for now.

build on native hardware and regtested on
  aarch64-none-elf, aarch64-none-elf (32 bit host),
  aarch64-none-linux-gnu

Cross-compiled and regtested on
  aarch64-none-linux-gnu, aarch64_be-none-linux-gnu

and no issues.

Ok for master??

Thanks,
Tamar

gas/
2018-09-24  Tamar Christina  <tamar.christina@arm.com>

	* config/tc-aarch64.c (force_automatic_sequence_close,
	aarch64_frob_section): New.
	* config/tc-aarch64.h (tc_frob_section, aarch64_frob_section): New.

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