Rename features to match what gcc and clang use.

There is no advantage in being different and using the same names simplifies
clang a bit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189141 91177308-0d34-0410-b5e6-96231b3b80d8
Update a test that I missed in the previous commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189143 91177308-0d34-0410-b5e6-96231b3b80d8
Replace more uses of sse41 with sse4.1.

llc using the host cpu features and *waning* on unknown features is probably
not a good thing :-(

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189144 91177308-0d34-0410-b5e6-96231b3b80d8
Update tests to use sse4.2 instead of sse42.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189145 91177308-0d34-0410-b5e6-96231b3b80d8
Update test to use rdrnd instead of rdrand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189146 91177308-0d34-0410-b5e6-96231b3b80d8