Unnecessary base ctor virtual call

[vasily-kirichenko]

type I() = class end

.method public specialname rtspecialname 
            instance void .ctor () cil managed 
        {
            // Method begins at RVA 0x2050
            // Code size 9 (0x9)
            .maxstack 8

            IL_0000: ldarg.0
            IL_0001: callvirt instance void [mscorlib]System.Object::.ctor()
            IL_0006: ldarg.0
            IL_0007: pop
            IL_0008: ret
        } // end of method I::.ctor

Compare to C#:

class I 
{
    public I() {}
}

.method public hidebysig specialname rtspecialname 
        instance void .ctor () cil managed 
    {
        // Method begins at RVA 0x2050
        // Code size 7 (0x7)
        .maxstack 8

        IL_0000: ldarg.0
        IL_0001: call instance void [mscorlib]System.Object::.ctor()
        IL_0006: ret
    } // end of method I::.ctor

[dsyme]

My understanding is that the choice of call instruction makes no difference to a JIT, as .ctor are always known to be non-virtual

(If someone sees a difference in generated assembly code then we can reopen this)

[dsyme]

(Reopening and labelling as "Feature improvement" since parity with C# codegen is a reasonable goal)

[dsyme]

Closing as duplicate of #2844