[clang] [clang][AArch64] Don't #define __ARM_FEATURE_CRC32 when -crc is specified in -target-feature (PR #132167)

[Tomas Matheson via cfe-commits]

tmatheson-arm wrote:

> There are lots of bugs like this in this area, this is not the only feature like this. Should this be fixed in a more general way?

We've looked at this internally but didn't get around to finishing it. `HasD128` etc map to `Extensions` in `AArch64Features.td`, I think the way to do it is to generate their declarations and initialisation code in `ARMTargetDefEmitter.cpp` (`AArch64TargetParserDef.inc`). @XiaShark if you'd like to look at it go ahead, otherwise let me know and I can put up a patch.

https://github.com/llvm/llvm-project/pull/132167