[llvm] [Hexagon] Provide a custom decoder for Y4_crswap10 (PR #153849)

[Alexey Karyakin via llvm-commits]

quic-akaryaki wrote:

> I mean, HexagonAsmParser parses "sgp1:0" as a register, but the generated AsmMatcher expects three AsmOperands for this Operand (Register SGP1, Token ":", and Immediate 0) because this is how TableGen backend parses the asm string.

I see.

https://github.com/llvm/llvm-project/pull/153849