Disable nop padding in R2R images and remove jumpstamps from the runtime (dotnet...

Disable nop padding in R2R images and remove jumpstamps from the runtime (dotnet/coreclr#26740)

Jumpstamps were used to version methods before we had the tiered compilation versioning mechanism. Jumpstamps had some negatives, that it was only supported on x86 and x64, that it required padding methods (bloated on disk IL code size), and that it required a runtime suspension to write the jumpstamps. By consolidating to one code versioning scheme we can delete a lot of code and support all architectures that tiered compilation does for rejit.

Commit migrated from https://github.com/dotnet/coreclr/commit/7fd79859530d6d6a05ae3b69adf2e0ca8a746bab