unwind: fix unwind build without heap

Add a missing guard for `_LIBUNWIND_NO_HEAP` around code dealing with the
`.cfi_remember_state` and `.cfi_restore_state` instructions.

Patch by Amanieu d'Antras!

GitOrigin-RevId: b31cb3aa5ee7ea92d830b06a0a7e42c7f2791dd4
1 file changed
tree: 953300bf43c9052001776efd7630755450a79248
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT