Create clang-stable symlink to the current stable toolchain
`repo upload` on macOS uses darwin-x86/clang-stable/bin/clang-format.
Unlike Linux, we do not need to worry so much about projects pulling
clang itself from clang-stable (which creates a hidden dependency). So
create a symlink is easier and avoid wasting disk space.
Test: repo upload
Bug: 263068264
Change-Id: I1e56085378fc03b727cfcfccaaad9d08db31654c
diff --git a/clang-stable b/clang-stable
new file mode 120000
index 0000000..69408ed
--- /dev/null
+++ b/clang-stable
@@ -0,0 +1 @@
+clang-r487747
\ No newline at end of file
