Recommit "[RISCV] Don't run loop-idiom-vectorize pass in the O0 pipeline. (#156798)"

With a dependency on the Passes library added this time.

Author: topperc

llvm/lib/Target/RISCV/CMakeLists.txt

@@ -88,6 +88,7 @@ add_llvm_target(RISCVCodeGen
   GlobalISel
   IPO
   MC
+  Passes
   RISCVDesc
   RISCVInfo
   Scalar

llvm/lib/Target/RISCV/RISCVTargetMachine.cpp

@@ -652,7 +652,8 @@ void RISCVPassConfig::addPostRegAlloc() {
 void RISCVTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
   PB.registerLateLoopOptimizationsEPCallback([=](LoopPassManager &LPM,
                                                  OptimizationLevel Level) {
-    LPM.addPass(LoopIdiomVectorizePass(LoopIdiomVectorizeStyle::Predicated));
+    if (Level != OptimizationLevel::O0)
+      LPM.addPass(LoopIdiomVectorizePass(LoopIdiomVectorizeStyle::Predicated));
   });
 }