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Re:A Race of Two Compilers: GraalVM JIT versus HotSpot JIT C... by lewurm on Monday June 17, 2019 @04:31AM (#20200976)
CoreCLR started to implemented Tiered Compilation https://github.com/dotnet/coreclr/blob/master/Documentation/...

It's experimental currently, no profile guided optimizations _yet_

Re:A Race of Two Compilers: GraalVM JIT versus HotSpot JIT C... by pjmlp on Monday June 17, 2019 @09:04AM (#20202481)
.NET Framework supports PGO since .NET 4.5.