JIT: Fix overzealous assert in CodeGen::genSSE42Intrinsic

src/coreclr/jit/hwintrinsiccodegenxarch.cpp

@@ -2239,7 +2239,7 @@ void CodeGen::genSSE42Intrinsic(GenTreeHWIntrinsic* node, insOpts instOptions)
         {
             assert(instOptions == INS_OPTS_NONE);
 
-            assert((op2->GetRegNum() != targetReg) || (op1Reg == targetReg));
+            assert(!op2->isUsedFromReg() || (op2->GetRegNum() != targetReg) || (op1Reg == targetReg));
             emit->emitIns_Mov(INS_mov, emitTypeSize(targetType), targetReg, op1Reg, /* canSkip */ true);
 
             if ((baseType == TYP_UBYTE) || (baseType == TYP_USHORT)) // baseType is the type of the second argument

src/tests/JIT/Regression/JitBlue/Runtime_105821/Runtime_105821.cs

@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+// Generated by Fuzzlyn v2.2 on 2024-08-01 15:50:23
+// Run on X64 Linux
+// Seed: 16776152078868034128-vectort,vector128,vector256,x86aes,x86avx,x86avx2,x86avx512bw,x86avx512bwvl,x86avx512cd,x86avx512cdvl,x86avx512dq,x86avx512dqvl,x86avx512f,x86avx512fvl,x86avx512fx64,x86bmi1,x86bmi1x64,x86bmi2,x86bmi2x64,x86fma,x86lzcnt,x86lzcntx64,x86pclmulqdq,x86popcnt,x86popcntx64,x86sse,x86ssex64,x86sse2,x86sse2x64,x86sse3,x86sse41,x86sse41x64,x86sse42,x86sse42x64,x86ssse3,x86x86base
+// Reduced from 17.3 KiB to 0.4 KiB in 00:00:34
+// Hits JIT assert in Debug:
+// Assertion failed '(op2->GetRegNum() != targetReg) || (op1Reg == targetReg)' in 'Program:M1(short)' during 'Generate code' (IL size 18; hash 0xb20f93e4; MinOpts)
+// 
+//     File: /__w/1/s/src/coreclr/jit/hwintrinsiccodegenxarch.cpp Line: 2242
+// 
+using System;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
+using Xunit;
+
+public class Runtime_105821
+{
+    [Fact]
+    public static void TestEntryPoint()
+    {
+        if (Sse42.IsSupported)
+        {
+            Assert.Throws<DivideByZeroException>(() => M1(0));
+        }
+    }
+
+    private static void M1(short arg0)
+    {
+        Sse42.Crc32(Bmi2.ParallelBitDeposit(0, 0) % 0, (uint)arg0);
+    }
+}

src/tests/JIT/Regression/JitBlue/Runtime_105821/Runtime_105821.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <Optimize>False</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).cs" />
+  </ItemGroup>
+</Project>