[SimplifyQuery] Avoid PatternMatch.h include (NFC)

Move the one method that uses it out of line. This is primarily to
reduce the number of files to rebuild when changing PatternMatch.h.

llvm/include/llvm/Analysis/InstructionSimplify.h

@@ -32,6 +32,7 @@
 #define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
 
 #include "llvm/Analysis/SimplifyQuery.h"
+#include "llvm/IR/FPEnv.h"
 
 namespace llvm {
 
@@ -44,6 +45,7 @@ class DataLayout;
 class DominatorTree;
 class Function;
 class Instruction;
+class LoadInst;
 struct LoopStandardAnalysisResults;
 class Pass;
 template <class T, unsigned n> class SmallSetVector;

llvm/include/llvm/Analysis/SimplifyQuery.h

@@ -9,7 +9,7 @@
 #ifndef LLVM_ANALYSIS_SIMPLIFYQUERY_H
 #define LLVM_ANALYSIS_SIMPLIFYQUERY_H
 
-#include "llvm/IR/PatternMatch.h"
+#include "llvm/IR/Operator.h"
 
 namespace llvm {
 
@@ -106,13 +106,7 @@ struct SimplifyQuery {
 
   /// If CanUseUndef is true, returns whether \p V is undef.
   /// Otherwise always return false.
-  bool isUndefValue(Value *V) const {
-    if (!CanUseUndef)
-      return false;
-
-    using namespace PatternMatch;
-    return match(V, m_Undef());
-  }
+  bool isUndefValue(Value *V) const;
 
   SimplifyQuery getWithoutDomCondCache() const {
     SimplifyQuery Copy(*this);

llvm/include/llvm/Analysis/ValueTracking.h

@@ -20,6 +20,7 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/FMF.h"
+#include "llvm/IR/Instructions.h"
 #include "llvm/IR/InstrTypes.h"
 #include "llvm/IR/Intrinsics.h"
 #include <cassert>

llvm/lib/Analysis/BasicAliasAnalysis.cpp

@@ -44,6 +44,7 @@
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Operator.h"
+#include "llvm/IR/PatternMatch.h"
 #include "llvm/IR/Type.h"
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"

llvm/lib/Analysis/InstructionSimplify.cpp

@@ -7238,6 +7238,14 @@ const SimplifyQuery getBestSimplifyQuery(AnalysisManager<T, TArgs...> &AM,
 }
 template const SimplifyQuery getBestSimplifyQuery(AnalysisManager<Function> &,
                                                   Function &);
+
+bool SimplifyQuery::isUndefValue(Value *V) const {
+  if (!CanUseUndef)
+    return false;
+
+  return match(V, m_Undef());
+}
+
 } // namespace llvm
 
 void InstSimplifyFolder::anchor() {}