[RISCV] Allow libunwind to build for rv32e (#98855)

Don't try to save x16-x31 when using rv32e ISA

Note that I haven't actually tested yet whether or not unwinding
actually works on rv32e, but the code as-is doesn't even build.

NOKEYCHECK=True
GitOrigin-RevId: b33a675e3f5710bd56715e8058b541c21c325de0
2 files changed
tree: 9dde79fdbb13933aa55c891da0bfc992daca9fa8
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT