[llvm] [AMDGPU][MC] Fix disassemble of image_gather4 with d16 (PR #114609)

[Matt Arsenault via llvm-commits]

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@@ -1508,9 +1508,9 @@ multiclass MIMG_Gather <mimgopc op, AMDGPUSampleVariant sample, bit wqm = 0,
   let BaseOpcode = !cast<MIMGBaseOpcode>(NAME), WQM = wqm,
       Gather4 = 1 in {
     let VDataDwords = 2 in
-    defm _V2 : MIMG_Sampler_Src_Helper<op, asm, sample, VReg_64>; /* for packed D16 only */
+    defm _V2 : MIMG_Sampler_Src_Helper<op, asm, sample, VReg_64, 1>; /* for packed D16 only */
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arsenm wrote:

Use true and comment operand name? 

https://github.com/llvm/llvm-project/pull/114609