[SVE] Remove default false from VectorType::get(Type *, unsigned, bool)

[ctetreau]

Summary

Calls that used to use this default false should instead call FixedVectorType::get()

llvm/include/llvm/IR/DerivedTypes.h

LLVM_ATTRIBUTE_DEPRECATED(
       "getElementCount() and handle the case where Scalable is true or cast to "
       "FixedVectorType.");
 
   Type *getElementType() const { return ContainedType; }
 
   /// This static method is the primary way to construct an VectorType.
   static VectorType *get(Type *ElementType, ElementCount EC);
   static VectorType *get(Type *ElementType, unsigned NumElements,
-                         bool Scalable = false) {
+                         bool Scalable) {
     return VectorType::get(ElementType, {NumElements, Scalable});
   }
 
   static VectorType *get(Type *ElementType, const VectorType *Other) {
     return VectorType::get(ElementType, Other->getElementCount());
   }
 
   /// This static method gets a VectorType with the same number of elements as