Fix register resolution handling of RefTypeUpperVectorRestore (#92171)

After RefTypeUpperVectorRestore was handled, and an upper vector restore
IR node was added, LSRA incorrectly kept processing the
RefTypeUpperVectorRestore RefPosition. This led to incorrectly adding
a GTF_SPILL flag to the associated LCL_VAR. This in turn led some
LCL_VAR to be both last use and GTF_SPILL, which confused debug info processing:
it tried to "close" a range twice when it only expects to see a "close" operation
once.

Fixes #91215

src/coreclr/jit/lsra.cpp

@@ -7303,6 +7303,7 @@ void           LinearScan::resolveRegisters()
                     assert(!currentRefPosition->getInterval()->isLocalVar);
                     assert(currentRefPosition->getInterval()->firstRefPosition->spillAfter);
                 }
+
                 continue;
             }
             else if (currentRefPosition->refType == RefTypeUpperVectorRestore)
@@ -7323,6 +7324,8 @@ void           LinearScan::resolveRegisters()
                     }
                 }
                 localVarInterval->isPartiallySpilled = false;
+
+                continue;
             }
 #endif // FEATURE_PARTIAL_SIMD_CALLEE_SAVE
 

src/tests/JIT/Regression/JitBlue/Runtime_91215/Runtime_91215.cs

@@ -0,0 +1,43 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+// Found by Antigen
+
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.Arm;
+using System.Numerics;
+using Xunit;
+
+public class TestClass
+{
+    static ulong s_ulong_18 = 5;
+    static Vector128<ulong> s_v128_ulong_36 = Vector128.Create((ulong)5, 0);
+    Vector128<ulong> v128_ulong_87 = Vector128.CreateScalar((ulong)5);
+    private void Method0()
+    {
+        unchecked
+        {
+            s_ulong_18 = Vector128.Dot(v128_ulong_87 += s_v128_ulong_36 *= v128_ulong_87| (s_v128_ulong_36 = v128_ulong_87), v128_ulong_87 = (s_v128_ulong_36 *= Vector128<ulong>.Zero)* (v128_ulong_87 *= s_v128_ulong_36));
+            return;
+        }
+    }
+
+    [Fact]
+    public static void TestEntryPoint()
+    {
+        new TestClass().Method0();
+    }
+}
+/*
+Environment:
+
+set COMPlus_TieredCompilation=0
+set COMPlus_JitStress=2
+
+Assert failure(PID 6932 [0x00001b14], Thread: 5892 [0x1704]): Assertion failed '!m_VariableLiveRanges->back().m_EndEmitLocation.Valid()' in 'TestClass:Method0():this' during 'Generate code' (IL size 130; hash 0x46e9aa75; FullOpts)
+    File: D:\a\_work\1\s\src\coreclr\jit\codegencommon.cpp Line: 8729
+    Image: e:\kpathak\CORE_ROOT\corerun.exe
+*/

src/tests/JIT/Regression/JitBlue/Runtime_91215/Runtime_91215.csproj

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