Use llvm::Triple's methods to parse FreeBSD version numbers.

Who could've thought that FreeBSD would ever reach version 10!
Patch from Dimitry Andric.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142349 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed