[PM] Fix new PM to perform SpeculativeExecution as in old PM

Summary:
Old PM runs SpeculativeExecutionPass for targets that have divergent branches.
It uses `createSpeculativeExecutionIfHasBranchDivergencePass` that creates
the pass with `OnlyIfDivergentTarget=true`, whereas new PM just created the
pass with default `OnlyIfDivergentTarget=fase` so it unexpectedly runs and
causes buildbot test fails.

Reviewers: chandlerc, arsenm

Reviewed By: arsenm

Subscribers: wdng, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D82735

Author: dfukalov

llvm/lib/Passes/PassBuilder.cpp

@@ -584,7 +584,7 @@ PassBuilder::buildFunctionSimplificationPipeline(OptimizationLevel Level,
   }
 
   // Speculative execution if the target has divergent branches; otherwise nop.
-  FPM.addPass(SpeculativeExecutionPass());
+  FPM.addPass(SpeculativeExecutionPass(/* OnlyIfDivergentTarget =*/true));
 
   // Optimize based on known information about branches, and cleanup afterward.
   FPM.addPass(JumpThreadingPass());