[DynInst_API:] [dyninst/dyninst] 2c1506: For ARMv8 stack walking,

[Xiaozhu Meng <xmeng@xxxxxxxxxxx>]

  Branch: refs/heads/arm64-cray-fixes
  Home:   https://github.com/dyninst/dyninst
  Commit: 2c1506932c67c819f3ab119939b4d24f788044fd
      https://github.com/dyninst/dyninst/commit/2c1506932c67c819f3ab119939b4d24f788044fd
  Author: Xiaozhu Meng <xmeng@xxxxxxxxxxx>
  Date:   2018-05-21 (Mon, 21 May 2018)

  Changed paths:
    M stackwalk/src/aarch64-swk.C
    M stackwalk/src/linux-aarch64-swk.C
    M stackwalk/src/linux-swk.C

  Log Message:
  -----------
  For ARMv8 stack walking,
1. the signal return trampoline code is in the vsyscall page (vdso)
2. the ucontext_t structure is not on the top of the stack, but a specific offset. May need to find a better way to determine its location.
3. the FrameFuncStepper needs to check whether it should be applied



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