[libunwind][WebAssembly] Omit unused parts of libunwind.cpp for Wasm (#73196)

Wasm doesn't use most of that file; Wasm does not allow access of system
registers and those functionalities are provided from the VM.

GitOrigin-RevId: e88a2f123fa4843ae3782377668cf5741acc9121
1 file changed
tree: d83098e69017f28cd5b6b40a3cae75f15a391111
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT