Migrate SpanArr inline array from InvalidCSharp*.il to C#

src/tests/Loader/classloader/InlineArray/InlineArrayValid.cs

@@ -448,3 +448,21 @@ public static void InlineArrayEqualsGetHashCode_Fails()
         });
     }
 }
+
+[InlineArray(LengthConst)]
+public ref struct SpanArr
+{
+    private const int LengthConst = 100;
+    public Span<object> element;
+
+    public int Length => LengthConst;
+
+    [UnscopedRef]
+    public unsafe Span<object>* At(int index)
+    {
+        fixed (Span<object>* ptr = &element)
+        {
+            return ptr + index;
+        }
+    }
+}

src/tests/Loader/classloader/InlineArray/InvalidCSharpInlineArray.il

@@ -85,50 +85,3 @@
     .field private int32 a
     .field private int32 b
 }
-
-.class public sequential ansi sealed beforefieldinit SpanArr
-    extends [System.Runtime]System.ValueType
-{
-    .custom instance void [System.Runtime]System.Runtime.CompilerServices.IsByRefLikeAttribute::.ctor() = (
-        01 00 00 00
-    )
-    .custom instance void [System.Runtime]System.Runtime.CompilerServices.InlineArrayAttribute::.ctor(int32) = (
-        01 00 64 00 00 00 00 00
-    )
-
-    .field private static literal int32 LengthConst = int32(100)
-    .field public valuetype [System.Runtime]System.Span`1<object> element
-
-    .method public hidebysig
-        instance valuetype [System.Runtime]System.Span`1<object>* At (
-            int32
-        ) cil managed
-    {
-        .locals init (
-            [0] valuetype [System.Runtime]System.Span`1<object>& pinned
-        )
-        ldarg.0
-        ldflda valuetype [System.Runtime]System.Span`1<object> SpanArr::element
-        stloc.0
-        ldloc.0
-        conv.u
-        ldarg.1
-        conv.i
-        sizeof valuetype [System.Runtime]System.Span`1<object>
-        mul
-        add
-        ret
-    }
-
-    .method public hidebysig specialname
-        instance int32 get_Length () cil managed
-    {
-        ldc.i4.s 100
-        ret
-    }
-
-    .property instance int32 Length()
-    {
-        .get instance int32 SpanArr::get_Length()
-    }
-}