Port fix passing struct with four floats in registers via reflection to 1.1.0

src/vm/argdestination.h

@@ -136,7 +136,7 @@ class ArgDestination
                     _ASSERTE(eightByteSize == 4);
                     *(UINT32*)floatRegDest = *(UINT32*)src;
                 }
-                floatRegDest += 8;
+                floatRegDest += 16;
             }
             else
             {

tests/src/Regressions/coreclr/GitHub_7685/Test7685.csproj

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{E55A6F8B-B9E3-45CE-88F4-22AE70F606CB}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ReferencePath>$(ProgramFiles)\Common Files\microsoft shared\VSTT\11.0\UITestExtensionPackages</ReferencePath>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+    <NuGetPackageImportStamp>7a9bfb7d</NuGetPackageImportStamp>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <ReferenceLocalMscorlib>false</ReferenceLocalMscorlib>
+    <CLRTestKind>BuildAndRun</CLRTestKind>
+    <CLRTestPriority>1</CLRTestPriority>
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+  </PropertyGroup>
+  <ItemGroup>
+    <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+      <Visible>False</Visible>
+    </CodeAnalysisDependentAssemblyPaths>
+  </ItemGroup>
+  <ItemGroup>
+    <!-- Add Compile Object Here -->
+    <Compile Include="test7685.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="../../../Common/CoreCLRTestLibrary/CoreCLRTestLibrary.csproj" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+  <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' ">
+  </PropertyGroup>
+</Project>

tests/src/Regressions/coreclr/GitHub_7685/test7685.cs

@@ -0,0 +1,48 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+using System;
+using System.Reflection;
+
+public class Test7685
+{
+    static RectangleF argumentInDStuff;
+
+    public static int Main()
+    {
+        int iRetVal = 100;
+
+        var r = new RectangleF(1.2f, 3.4f, 5.6f, 7.8f);
+        typeof(Test7685).GetTypeInfo().GetDeclaredMethod("DoStuff").Invoke(null, new object[] { r });
+
+        if (!RectangleF.Equals(ref argumentInDStuff, ref r))
+        {
+            TestLibrary.Logging.WriteLine($"Error: passing struct with floats via reflection. Callee received {argumentInDStuff} instead of {r}");
+            iRetVal = 0;
+        }
+
+        return iRetVal;
+    }
+
+    public static void DoStuff(RectangleF r)
+    {
+        argumentInDStuff = r;
+    }
+}
+
+public struct RectangleF
+{
+    private float _x, _y, _width, _height;
+
+    public RectangleF(float x, float y, float width, float height)
+    {
+        _x = x; _y = y; _width = width; _height = height;
+    }
+
+    public static bool Equals(ref RectangleF r1, ref RectangleF r2)
+    {
+        return (r2._x == r1._x) && (r2._y == r1._y) && (r2._width == r1._width) && (r2._height == r1._height);
+    }
+
+    public override string ToString() => $"[{_x}, {_y}, {_width}, {_height}]";
+}