[CMake] Use LLVM_TARGET_TRIPLE in runtimes

This variable is derived from LLVM_DEFAULT_TARGET_TRIPLE by default,
but using a separate variable allows additional normalization to be
performed if needed.

Differential Revision: https://reviews.llvm.org/D137451

GitOrigin-RevId: bec8a372fc0db95852748691c0f4933044026b25
2 files changed
tree: 8be1ee0f2b257e1cd1ea91d978be7fbb4cac7115
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt