[libunwind] Use __builtin_alloca to avoid missing include

Differential Revision: https://reviews.llvm.org/D149635

GitOrigin-RevId: 3f6818bf444f902a64a7604e67b92cf8c98b3f56
1 file changed
tree: 2dbc2fea99cd69c0c1663caa8cdae42eb90cd367
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT