[llvm] [profcheck][coro] Adding Branch weights PGO in Coroutines Passes (PR #184466)

[Mircea Trofin via llvm-commits]

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@@ -1368,6 +1374,20 @@ static void rewritePHIsForCleanupPad(BasicBlock *CleanupPadBB,
     SwitchOnDispatch->addCase(SwitchConstant, CaseBB);
     SwitchIndex++;
   }
+
+  if (!ProfcheckDisableMetadataFixes) {
+    // Add branch weights to SwitchOnDispatch, where branches are unreachable by
+    // default. We mark all branches as having equal weights because they are
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mtrofin wrote:

so all including the default have the same weight? wouldn't this be equivalent to marking `unknown`?

https://github.com/llvm/llvm-project/pull/184466