[VNCoercion] Use IRBuilderBase; NFC

And remove include from header.

include/llvm/Transforms/Utils/VNCoercion.h

@@ -20,14 +20,15 @@
 
 #ifndef LLVM_TRANSFORMS_UTILS_VNCOERCION_H
 #define LLVM_TRANSFORMS_UTILS_VNCOERCION_H
-#include "llvm/IR/IRBuilder.h"
 
 namespace llvm {
+class Constant;
 class Function;
 class StoreInst;
 class LoadInst;
 class MemIntrinsic;
 class Instruction;
+class IRBuilderBase;
 class Value;
 class Type;
 class DataLayout;
@@ -44,7 +45,7 @@ bool canCoerceMustAliasedValueToLoad(Value *StoredVal, Type *LoadTy,
 ///
 /// If we can't do it, return null.
 Value *coerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
-                                      IRBuilder<> &IRB, const DataLayout &DL);
+                                      IRBuilderBase &IRB, const DataLayout &DL);
 
 /// This function determines whether a value for the pointer LoadPtr can be
 /// extracted from the store at DepSI.

lib/Transforms/Utils/VNCoercion.cpp

@@ -144,7 +144,8 @@ static T *coerceAvailableValueToLoadTypeHelper(T *StoredVal, Type *LoadedTy,
 ///
 /// If we can't do it, return null.
 Value *coerceAvailableValueToLoadType(Value *StoredVal, Type *LoadedTy,
-                                      IRBuilder<> &IRB, const DataLayout &DL) {
+                                      IRBuilderBase &IRB,
+                                      const DataLayout &DL) {
   return coerceAvailableValueToLoadTypeHelper(StoredVal, LoadedTy, IRB, DL);
 }