Bump llvm-rs-cc version number to 1901.

BUG: 12135682
https://code.google.com/p/android/issues/detail?id=64775

This is to ensure that we can recognize tools that have the fix for encoding
bitcode attributes like readnone/readonly on parameters (i.e. we strip it).

Change-Id: I303c0c730c66706425289c6dc7d494dcb075120d
1 file changed