[VP] Make VectorBuilder take IRBuilderBase instead of IRBuilder<>

[craig.topper]

Summary

IRBuilder<> assumes specific values for template parameters.
IRBuilderBase abstracts away the template.

llvm/include/llvm/IR/VectorBuilder.h

enum class Behavior {
 
     // Return a default-initialized value if the requested VP intrinsic could
     // not be created.
     // This is useful for a defensive fallback to non-VP code.
     SilentlyReturnNone = 1,
   };
 
 private:
-  IRBuilder<> &Builder;
+  IRBuilderBase &Builder;
   Behavior ErrorHandling;
 
   // Explicit mask parameter.
   Value *Mask;
   // Explicit vector length parameter.
   Value *ExplicitVectorLength;
   // Compile-time vector length.
   ElementCount StaticVectorLength;
 
   // Get mask/evl value handles for the current configuration.
   Value &requestMask();
   Value &requestEVL();
 
   void handleError(const char *ErrorMsg) const;
   template <typename RetType>
   RetType returnWithError(const char *ErrorMsg) const {
     handleError(ErrorMsg);
     return RetType();
   }
 
 public:
-  VectorBuilder(IRBuilder<> &Builder,
+  VectorBuilder(IRBuilderBase &Builder,
                 Behavior ErrorHandling = Behavior::ReportAndAbort)
       : Builder(Builder), ErrorHandling(ErrorHandling), Mask(nullptr),
         ExplicitVectorLength(nullptr),
         StaticVectorLength(ElementCount::getFixed(0)) {}
 
   Module &getModule() const;
   LLVMContext &getContext() const { return Builder.getContext(); }