Revert "[SVE] Remove default-false VectorType::get"

This reverts commit 1da09b7.

Author: vladimirlaz

llvm/include/llvm/IR/DerivedTypes.h

@@ -444,6 +444,17 @@ class VectorType : public Type {
   /// This static method is the primary way to construct an VectorType.
   static VectorType *get(Type *ElementType, ElementCount EC);
 
+  /// Base class getter that specifically constructs a FixedVectorType. This
+  /// function is deprecated, and will be removed after LLVM 11 ships. Since
+  /// this always returns a FixedVectorType via a base VectorType pointer,
+  /// FixedVectorType::get(Type *, unsigned) is strictly better since no cast is
+  /// required to call getNumElements() on the result.
+  LLVM_ATTRIBUTE_DEPRECATED(
+      inline static VectorType *get(Type *ElementType, unsigned NumElements),
+      "The base class version of get with the scalable argument defaulted to "
+      "false is deprecated. Either call VectorType::get(Type *, unsigned, "
+      "bool) and pass false, or call FixedVectorType::get(Type *, unsigned).");
+
   static VectorType *get(Type *ElementType, unsigned NumElements,
                          bool Scalable) {
     return VectorType::get(ElementType, {NumElements, Scalable});
@@ -538,6 +549,10 @@ class VectorType : public Type {
   }
 };
 
+inline VectorType *VectorType::get(Type *ElementType, unsigned NumElements) {
+  return VectorType::get(ElementType, NumElements, false);
+}
+
 /// Class to represent fixed width SIMD vectors
 class FixedVectorType : public VectorType {
 protected: