Tomas Matheson 70dbd7bb12 [ARM][AArch64] Use StringRef in TargetParser structs ...

The invalid case is now represented by an empty StringRef rather than
a nullptr.

Previously ARCH_FEATURE was build from SUB_ARCH by prepending "+".
This is now reverse, so that the "+arch-feature" is now visible in
the .def, which is a bit clearer. This meant converting one StringSwitch
into a loop.

Removed getters which are now mostly unnecessary.

Removed some old FIXMEs.

Differential Revision: https://reviews.llvm.org/D138026

2022-11-17 18:44:06 +00:00

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