[clang] [clang-tools-extra] [Clang] Use TargetInfo when deciding is an address space is compatible (PR #115777)

[John McCall via cfe-commits]

rjmccall wrote:

I'm not sure what you're saying would need to pulled into a .cpp file.  It looks like there's only one actual call to `TI.isAddressSpaceSupersetOf`, so if you just pass around an `ASTContext &` to that point, nothing else will need to drill into it.  And frankly that entire expression in `Qualifiers::isAddressSpaceSupersetOf` after the equality check is so unwieldy that it probably ought to have been pulled into a .cpp file a long time ago.

https://github.com/llvm/llvm-project/pull/115777