[llvm] [clang] [TargetParser] Define AEK_FCMA and AEK_JSCVT for tsv110 (PR #75516)

[Bryan Chan via cfe-commits]

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@@ -81,6 +81,15 @@ static bool DecodeAArch64Features(const Driver &D, StringRef text,
     else
       return false;
 
+    // +jsconv and +complxnum implies +neon and +fp-armv8
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bryanpkc wrote:

@momchil-velikov Thank you for your answer. It is strange that the wording in the Arm ARM is so strict. It is well understood that an Armv8.*x*-A processor can implement any feature from the next *.x* generation (see [Understanding the Armv8.x extensions](https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/Learn%20the%20Architecture/Understanding%20the%20Armv8.x%20extensions.pdf)).

The rationale for this change is to enable the use of these ISA features on an Armv8.2-a processor (such as TSV110 and other similar chips), by making the command-line options available.

https://github.com/llvm/llvm-project/pull/75516