Runs with DOTNET_JitEnablePhysicalPromotion

[cincuranet]

cc @jakobbotsch

[danmoseley]

What does this mode do?

[jakobbotsch]

@danmoseley There's some more information in dotnet/runtime#76928. This mode generalizes the JIT's ability to handle and optimize structs, with the goal being to enable it by default, so I am trying to use the benchmarking infrastructure to get ahead of potential regressions.