Revert "[llvm][IR] Extend BranchWeightMetadata to track provenance of weights" (#95060)

Reverts llvm/llvm-project#86609

This change causes compile-time regressions for stage2 builds
(https://llvm-compile-time-tracker.com/compare.php?from=3254f31a66263ea9647c9547f1531c3123444fcd&to=c5978f1eb5eeca8610b9dfce1fcbf1f473911cd8&stat=instructions:u).
It also introduced unintended changes to `.text` which should be
addressed before relanding.

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
index 04042e7..3d950b15 100644
--- a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp
@@ -390,13 +390,13 @@ static void updateBranchWeights(BranchInst &PreHeaderBI, BranchInst &LoopBI,
       SuccsSwapped ? LoopBackWeight : ExitWeight1,
       SuccsSwapped ? ExitWeight1 : LoopBackWeight,
   };
-  setBranchWeights(LoopBI, LoopBIWeights, /*IsExpected=*/false);
+  setBranchWeights(LoopBI, LoopBIWeights);
   if (HasConditionalPreHeader) {
     const uint32_t PreHeaderBIWeights[] = {
         SuccsSwapped ? EnterWeight : ExitWeight0,
         SuccsSwapped ? ExitWeight0 : EnterWeight,
     };
-    setBranchWeights(PreHeaderBI, PreHeaderBIWeights, /*IsExpected=*/false);
+    setBranchWeights(PreHeaderBI, PreHeaderBIWeights);
   }
 }