Daniel re-educated me about what Alias does and does not do. Turn that off for

Daniel re-educated me about what Alias does and does not do. Turn that off for
'-fasm' and explicitly map from that flag to -fgnu-keywords in the driver. Turn
off the driver in the lexer test for this madness and add a test to the driver
that the translation actually works.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104428 91177308-0d34-0410-b5e6-96231b3b80d8