[RFC] Support pseudo probe for Windows COFF

IR & Optimizations
1

Hi folks,

Pseudo probe is a great alternative to debug location for sampling PGO.

  • We don’t need to worry about losing debug info with it.
  • It’s granularity is also better than debug location since each BB and CallInst is marked by unique pseudo probe Index.

Currently it only supports ELF.
As you may have already known we have supported Sampling PGO for Windows COFF. We would like to support pseudo probe for COFF to take advantages of it.

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Implementation:

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@WenleiHe