[sancov] Adopt createUnlikelyBranchWeights in CreateGateBranch

[thetruestblue]

Adopt the extracted branch weights method added here: c60aa43

[llvmbot]

@llvm/pr-subscribers-llvm-transforms

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: None (thetruestblue)

Changes

Adopt the extracted branch weights method added here: c60aa43

---

Full diff: https://github.com/llvm/llvm-project/pull/117398.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp (+1-1)

diff --git a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index 139e75dd3ddb34..ae97c6fc86dae9 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -831,7 +831,7 @@ Instruction *ModuleSanitizerCoverage::CreateGateBranch(Function &F,
   // Set the branch weights in order to minimize the price paid when the
   // gate is turned off, allowing the default enablement of this
   // instrumentation with as little of a performance cost as possible
-  auto Weights = MDBuilder(*C).createBranchWeights(1, 100000);
+  auto Weights = MDBuilder(*C).createUnlikelyBranchWeights();
   return SplitBlockAndInsertIfThen(FunctionGateCmp, IP, false, Weights);
 }
 

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