Invalidate analyses after running Attributor in OpenMPOpt (#74908)

Using the LoopInfo from OMPInfoCache after the Attributor ran resulted
in a crash due to it being in an invalid state.

---------

Co-authored-by: Ivan Radanov Ivanov <[email protected]>

Author: ivanradanov

llvm/include/llvm/Transforms/IPO/Attributor.h

@@ -1157,6 +1157,12 @@ struct AnalysisGetter {
     return nullptr;
   }
 
+  /// Invalidates the analyses. Valid only when using the new pass manager.
+  void invalidateAnalyses() {
+    assert(FAM && "Can only be used from the new PM!");
+    FAM->clear();
+  }
+
   AnalysisGetter(FunctionAnalysisManager &FAM, bool CachedOnly = false)
       : FAM(&FAM), CachedOnly(CachedOnly) {}
   AnalysisGetter(Pass *P, bool CachedOnly = false)
@@ -1286,6 +1292,10 @@ struct InformationCache {
     return AssumeOnlyValues.contains(&I);
   }
 
+  /// Invalidates the cached analyses. Valid only when using the new pass
+  /// manager.
+  void invalidateAnalyses() { AG.invalidateAnalyses(); }
+
   /// Return the analysis result from a pass \p AP for function \p F.
   template <typename AP>
   typename AP::Result *getAnalysisResultForFunction(const Function &F,

llvm/lib/Transforms/IPO/OpenMPOpt.cpp

@@ -2053,6 +2053,9 @@ struct OpenMPOpt {
     LLVM_DEBUG(dbgs() << "[Attributor] Done with " << SCC.size()
                       << " functions, result: " << Changed << ".\n");
 
+    if (Changed == ChangeStatus::CHANGED)
+      OMPInfoCache.invalidateAnalyses();
+
     return Changed == ChangeStatus::CHANGED;
   }