[PATCH] Add support for parsing ARM symbol variants on ELF targets

[Tim Northover]

Hi David,

> I've attached a patch that removes most of the VK_ARM_* types along with
> parsing the variants correctly for ARM.

Thanks! I love seeing refactoring like this. I've got one comment:

+      if (Lexer.isNot(AsmToken::RParen)) {
+          return Error(Lexer.getTok().getLoc(), "unexpected token in variant");

I think this error message could be more helpful if it mentions that
we expect a closing paren. I'd be happy for you to fix that and commit
without posting another patch for review -- I'll take a look at the
commit.

Cheers.

Tim.