[llvm] [clang] [PGO][nfc] Add `-fdiagnostics-show-profile-count` option to show real loop count from instr-profile (PR #75021)

[Jan Svoboda via cfe-commits]

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@@ -2091,6 +2091,12 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
   bool UsingProfile =
       UsingSampleProfile || !Opts.ProfileInstrumentUsePath.empty();
 
+  if (Args.hasArg(options::OPT_fdiagnostics_show_profile_count) &&
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jansvoboda11 wrote:

If this option exists in `-cc1` only to emit a warning without being used for anything else, I suggest moving the diagnostic to the driver and removing the `-cc1` option.

https://github.com/llvm/llvm-project/pull/75021