[llvm] [Xtensa] Implement Code Density Option. (PR #119639)

[Andrei Safronov via llvm-commits]

================
@@ -190,6 +188,28 @@ static DecodeStatus decodeImm1_16Operand(MCInst &Inst, uint64_t Imm,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus decodeImm1n_15Operand(MCInst &Inst, uint64_t Imm,
----------------
andreisfr wrote:

I added disassembler test.

https://github.com/llvm/llvm-project/pull/119639