Add --use_src_head.

This flag is used in non-bisecting mode by Android llvm builder,
to use the HEAD of src_path directory as is,
without calling git_llvm_rev or get_llvm_hash.

BUG=None
TEST=None
Change-Id: I99f75936d85b969009df3648d4759ff98e63bd4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2037149
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Chih-Hung Hsieh <chh@google.com>
Commit-Queue: Chih-Hung Hsieh <chh@google.com>
Auto-Submit: Chih-Hung Hsieh <chh@google.com>
1 file changed