[PATCH] Implement AsmParser for ARM unwind directives.

[Logan Chien]

Hi asl,

This commit implements the AsmParser for fnstart, fnend,
cantunwind, personality, handlerdata, pad, setfp, save, and
vsave directives.

This commit fixes some minor issue in the ARMELFStreamer:

* The switch back to corresponding section after the .fnend
  directive.

* Emit the unwind opcode while processing .fnend directive
  if there is no .handlerdata directive.

* Emit the unwind opcode to .ARM.extab while processing
  .handlerdata even if .personality directive does not exist.

Fix ARM unwind opcode assembler in several cases.

Changes to ARM unwind opcode assembler:

* Fix multiple .save or .vsave directives.  Besides, the
  order is preserved now.

* For the directives which will generate multiple opcodes,
  such as ".save {r0-r11}", the order of the unwind opcode
  is fixed now, i.e. the registers with less encoding value
  are popped first.

* Fix the $sp offset calculation.  Now, we can use the
  .setfp, .pad, .save, and .vsave directives at any order.

Changes to test cases:

* Add test case to check the order of multiple opcodes
  for the .save directive.

* Fix the incorrect $sp offset in the test case.  The
  stack pointer offset specified in the test case was
  incorrect.

* The opcode to restore $sp are slightly reordered.  The
  behavior are not changed, and the new output is same
  as the output of GNU as.  (File: eh-directive-pad.s,
  eh-directive-setfp.s)

http://llvm-reviews.chandlerc.com/D738

Files:
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
  lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
  lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.h
  test/CodeGen/ARM/ehabi-mc-section.ll
  test/CodeGen/ARM/ehabi-mc.ll
  test/MC/ARM/eh-compact-pr0.s
  test/MC/ARM/eh-compact-pr1.s
  test/MC/ARM/eh-directive-cantunwind-diagnostics.s
  test/MC/ARM/eh-directive-cantunwind.s
  test/MC/ARM/eh-directive-fnend-diagnostics.s
  test/MC/ARM/eh-directive-fnstart-diagnostics.s
  test/MC/ARM/eh-directive-handlerdata.s
  test/MC/ARM/eh-directive-multiple-offsets.s
  test/MC/ARM/eh-directive-pad-diagnostics.s
  test/MC/ARM/eh-directive-pad.s
  test/MC/ARM/eh-directive-personality-diagnostics.s
  test/MC/ARM/eh-directive-personality.s
  test/MC/ARM/eh-directive-save-diagnoatics.s
  test/MC/ARM/eh-directive-save.s
  test/MC/ARM/eh-directive-section-comdat.s
  test/MC/ARM/eh-directive-section-multiple-func.s
  test/MC/ARM/eh-directive-section.s
  test/MC/ARM/eh-directive-setfp-diagnostics.s
  test/MC/ARM/eh-directive-setfp.s
  test/MC/ARM/eh-directive-text-section-multiple-func.s
  test/MC/ARM/eh-directive-text-section.s
  test/MC/ARM/eh-directive-vsave-diagnostics.s
  test/MC/ARM/eh-directive-vsave.s
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