Add lld CSPGO (Contex-Sensitive PGO) options for COFF target.
Reference the ELF options from https://reviews.llvm.org/D56675
This patch is to enable CSPGO for Thinlto in lld on Windows. Could you please help review?
This looks good to me. But I'll let other approve this.
Thank you Rong. Any feedback from other reviewers?
I have verified this works for both old and new pass manager.
I don't have much experience on lld. No objections.