[Pass] Add variadic function templates for PreservedAnalyses

So it is possible to use `PA.preserve<Analysis1, Analysis2>();`

Author: paperchalice

llvm/include/llvm/IR/Analysis.h

@@ -133,6 +133,11 @@ class PreservedAnalyses {
     return *this;
   }
 
+  /// Mark multiple analyses as preserved.
+  template <typename... AnalysisTs> PreservedAnalyses &preserve() {
+    return preserve(AnalysisTs::ID()...);
+  }
+
   /// Given an analysis's ID, mark the analysis as preserved, adding it
   /// to the set.
   PreservedAnalyses &preserve(AnalysisKey *ID) {
@@ -146,12 +151,23 @@ class PreservedAnalyses {
     return *this;
   }
 
+  /// Mark analyses as preserved using IDs.
+  template <typename... AnalysisKeyPtrs>
+  PreservedAnalyses &preserve(AnalysisKeyPtrs... IDs) {
+    return preserve(IDs), ..., *this;
+  }
+
   /// Mark an analysis set as preserved.
   template <typename AnalysisSetT> PreservedAnalyses &preserveSet() {
     preserveSet(AnalysisSetT::ID());
     return *this;
   }
 
+  /// Mark analysis sets as preserved.
+  template <typename AnalysisSetTs> PreservedAnalyses &preserveSet() {
+    return preserveSet(AnalysisSetT::ID()...);
+  }
+
   /// Mark an analysis set as preserved using its ID.
   PreservedAnalyses &preserveSet(AnalysisSetKey *ID) {
     // If we're not already in the saturated 'all' state, add this set.
@@ -160,6 +176,12 @@ class PreservedAnalyses {
     return *this;
   }
 
+  /// Mark analysis sets as preserved using IDs.
+  template <typename... AnalysisSetKeyPtrs>
+  PreservedAnalyses &preserveSet(AnalysisSetKeyPtrs... IDs) {
+    return preserveSet(IDs), ..., *this;
+  }
+
   /// Mark an analysis as abandoned.
   ///
   /// An abandoned analysis is not preserved, even if it is nominally covered
@@ -172,6 +194,11 @@ class PreservedAnalyses {
     return *this;
   }
 
+  /// Mark analyses as abandoned.
+  template <typename... AnalysisTs> PreservedAnalyses &abandon() {
+    return abandon(AnalysisTs::ID()...);
+  }
+
   /// Mark an analysis as abandoned using its ID.
   ///
   /// An abandoned analysis is not preserved, even if it is nominally covered
@@ -185,6 +212,12 @@ class PreservedAnalyses {
     return *this;
   }
 
+  /// Mark analyses as abandoned using IDs.
+  template <typename... AnalysisKeyPtrs>
+  PreservedAnalyses &abandon(AnalysisKeyPtrs... IDs) {
+    return abandon(IDs), ..., *this;
+  }
+
   /// Intersect this set with another in place.
   ///
   /// This is a mutating operation on this preserved set, removing all