Adjust llvm-ar and llvm-ranlib to not depend on exception handling.

Adjust llvm-ar and llvm-ranlib to not depend on exception handling.
Always use an exit code of 1, but print the help message if useful.
Remove the exception handling tag in llvm-as, llvm-dis and
llvm-bcanalyzer, where it isn't used.

llvm-svn: 166767