[libunwind][NFC] Remove the CET keyword in shadow stack-related stuffs (#126663)

libunwind currently supports shadow stack based on the Intel CET and
AArch64 GCS technology, but throughout related codes, the Intel-specific
keyword, "CET", is used to refer to the generic concept of control-flow
integrity/shadow stack. This patch replaces such wordings with
architecture-neutral term "shadow stack" (abbr. "shstk") to allow future
implementation to avoid using the Intel-specific "CET" term.

NOKEYCHECK=True
GitOrigin-RevId: 507e413a2d85fb25f70caa9ef843f7c7cffb94c6
5 files changed
tree: 89ea8e76271de27d7d1d84c9d6c1efa286a00be8
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT