R2R jobs should not pass -O to crossgen2

[jakobbotsch]

When -O is passed, crossgen2 will ignore the assembly's "debug" bit. We have some JIT tests that rely on this bit to be respected which are currently disabled because of this behavior since our R2R jobs pass -O. Some more discussion in #55062.

cc @dotnet/crossgen-contrib

[MichalStrehovsky]

The jobs should be changed not to pass -O. The -O was required to optimize before #44514 got merged.

The -O was supposed to be removed per #44514 (comment) but it probably slipped through the cracks.

[jakobbotsch]

The -O parameter was readded in #49867 it looks like.

[MichalStrehovsky]

Ah okay, I don't know what going on there then. I'll leave that to the crossgen team.

[mangod9]

@jakobbotsch, is this a blocker for .net 6?

[jakobbotsch]

@mangod9 No, the test is just disabled for R2R jobs at the moment. Reenabling it can wait.

[mangod9]

Ok thanks will move to 7