diff --git a/llvm/include/llvm/IR/DerivedTypes.h b/llvm/include/llvm/IR/DerivedTypes.h
--- a/llvm/include/llvm/IR/DerivedTypes.h
+++ b/llvm/include/llvm/IR/DerivedTypes.h
@@ -537,8 +537,6 @@
   }
 };
 
-bool Type::isVectorTy() const { return isa<VectorType>(this); }
-
 /// Class to represent fixed width SIMD vectors
 class FixedVectorType : public VectorType {
 protected:
@@ -705,12 +703,6 @@
   return cast<PointerType>(getScalarType())->getAddressSpace();
 }
 
-Type *Type::getScalarType() const {
-  if (isVectorTy())
-    return cast<VectorType>(this)->getElementType();
-  return const_cast<Type *>(this);
-}
-
 } // end namespace llvm
 
 #endif // LLVM_IR_DERIVEDTYPES_H
diff --git a/llvm/include/llvm/IR/Type.h b/llvm/include/llvm/IR/Type.h
--- a/llvm/include/llvm/IR/Type.h
+++ b/llvm/include/llvm/IR/Type.h
@@ -228,7 +228,9 @@
   bool isPtrOrPtrVectorTy() const { return getScalarType()->isPointerTy(); }
 
   /// True if this is an instance of VectorType.
-  inline bool isVectorTy() const;
+  inline bool isVectorTy() const {
+    return getTypeID() == ScalableVectorTyID || getTypeID() == FixedVectorTyID;
+  }
 
   /// Return true if this type could be converted with a lossless BitCast to
   /// type 'Ty'. For example, i8* to i32*. BitCasts are valid for types of the
@@ -304,7 +306,11 @@
 
   /// If this is a vector type, return the element type, otherwise return
   /// 'this'.
-  inline Type *getScalarType() const;
+  inline Type *getScalarType() const {
+    if (isVectorTy())
+      return getContainedType(0);
+    return const_cast<Type *>(this);
+  }
 
   //===--------------------------------------------------------------------===//
   // Type Iteration support.