Incorrect IL generated for function pointer call with in parameter

[dgrunwald]

Version Used: Visual Studio 2019 16.8.0 Preview 2.1

Steps to Reproduce:

    unsafe class Program
    {
        static void Main(string[] args)
        {
            delegate*<in int, ref char, void> F = &Test;
            char c = 'a';
            F(int.MaxValue, ref c);
        }

        public static void Test(in int b, ref char c)
        {
            Console.WriteLine($"b = {b}, c = {c}");
        }
    }

Expected Behavior:
b = 2147483647, c = a

Actual Behavior:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at CSharpCore.Program.Test(Int32 ByRef, Char ByRef)
   at CSharpCore.Program.Main(System.String[])

The IL code passes int.MaxValue directly, when it should be passing the address of a temporary.

	IL_0000: nop
	IL_0001: ldarg.0
	IL_0002: ldfld method void *(uint8& modreq([System.Runtime]System.Runtime.InteropServices.InAttribute), char&) CSharpCore.FunctionPointersWithRefParams::F1 /* 04000003 */
	IL_0007: stloc.0
	IL_0008: ldc.i4.1
	IL_0009: ldarga.s c
	IL_000b: ldloc.0
	IL_000c: calli void(uint8& modreq([System.Runtime]System.Runtime.InteropServices.InAttribute), char&) /* 11000004 */
	IL_0011: nop
	IL_0012: ret

Note: removing the ref char c parameter causes the in int b parameter to be passed correctly.