This might make the error message added in r335668 unneeded, but I'm not sure yet.
The check for RIP is technically unnecessary since RIP is in GR64, but that fact is kind of surprising so be explicit.
llvm-svn: 336217
Right now, when we use RIP-relative instructions in 32-bit mode, we'll just
assert and crash.
This adds an error message which tells the user that they can't do that in
32-bit mode, so that we don't crash (and also can see the issue outside of
assert builds).
llvm-svn: 335658
Craig Topper