[release/7.0] Use the regType for extracting the RegisterType (#74670)

* Use the regType for extracting the RegisterType

* Add test case

Co-authored-by: Kunal Pathak <Kunal.Pathak@microsoft.com>

src/coreclr/jit/lsrabuild.cpp

@@ -3524,11 +3524,11 @@ int LinearScan::BuildStoreLoc(GenTreeLclVarCommon* storeLoc)
  else if (op1->isContained() && op1->OperIs(GT_BITCAST))
  {
  GenTree* bitCastSrc = op1->gtGetOp1();
- RegisterType registerType = bitCastSrc->TypeGet();
+ RegisterType registerType = regType(bitCastSrc->TypeGet());
  singleUseRef = BuildUse(bitCastSrc, allRegs(registerType));
 
  Interval* srcInterval = singleUseRef->getInterval();
- assert(srcInterval->registerType == registerType);
+ assert(regType(srcInterval->registerType) == registerType);
  srcCount = 1;
  }
 #ifndef TARGET_64BIT

src/tests/JIT/Regression/JitBlue/Runtime_74373/Runtime_73821.cs

@@ -0,0 +1,29 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+public class _74373
+{
+ public static int Main(string[] args)
+ {
+ Problem(10);
+ return 100;
+ }
+
+ [MethodImpl(MethodImplOptions.NoInlining)]
+ private static unsafe float Problem(long x)
+ {
+ var y = BitConverter.Int32BitsToSingle((int)x);
+ Use(&x);
+ JitUse(0);
+ return y;
+ }
+
+ public static unsafe void Use(long* arg) { }
+
+ [MethodImpl(MethodImplOptions.NoInlining)]
+ public static void JitUse<T>(T arg) { }
+}

src/tests/JIT/Regression/JitBlue/Runtime_74373/Runtime_73821.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+ <PropertyGroup>
+ <OutputType>Exe</OutputType>
+ <Optimize>True</Optimize>
+ <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+ </PropertyGroup>
+ <ItemGroup>
+ <Compile Include="$(MSBuildProjectName).cs" />
+ </ItemGroup>
+</Project>