[AMDGPU] Add divergence analysis as a dependency for ISel

[rampitec]

Summary

AMDGPUDAGToDAGISel adds DivergenceAnalysis in getAnalysisUsage but does not list it in pass dependencies which may lead to crash.

[alex-t]

Thanks for catching this

llvm/trunk/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

bool SelectADDRVTX_READ(SDValue Addr, SDValue &Base,
                           SDValue &Offset) override;
 };
 
 }  // end anonymous namespace
 
 INITIALIZE_PASS_BEGIN(AMDGPUDAGToDAGISel, "isel",
                       "AMDGPU DAG->DAG Pattern Instruction Selection", false, false)
 INITIALIZE_PASS_DEPENDENCY(AMDGPUArgumentUsageInfo)
+INITIALIZE_PASS_DEPENDENCY(DivergenceAnalysis)
 INITIALIZE_PASS_END(AMDGPUDAGToDAGISel, "isel",
                     "AMDGPU DAG->DAG Pattern Instruction Selection", false, false)
 
 /// This pass converts a legalized DAG into a AMDGPU-specific
 // DAG, ready for instruction scheduling.
 FunctionPass *llvm::createAMDGPUISelDag(TargetMachine *TM,
                                         CodeGenOpt::Level OptLevel) {
   return new AMDGPUDAGToDAGISel(TM, OptLevel);