[llvm] [AMDGPU] Eliminate likely-spurious execz checks (PR #117567)

[Fabian Ritter via llvm-commits]

================
@@ -0,0 +1,257 @@
+//===- AMDGPUAnnotateVaryingBranchWeights.cpp -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// Estimate if conditional branches for which SIAnnotateControlFlow introduced
+// amdgcn_if or amdgcn_else intrinsics are likely to have different outcomes for
+// the threads of each wavefront. If that is the case, BranchWeight metadata is
----------------
ritter-x2a wrote:

Adjusted in 086ac46bce78a849eae39275c7601ad645783024.

https://github.com/llvm/llvm-project/pull/117567