diff --git a/llvm/include/llvm/IR/Intrinsics.h b/llvm/include/llvm/IR/Intrinsics.h
--- a/llvm/include/llvm/IR/Intrinsics.h
+++ b/llvm/include/llvm/IR/Intrinsics.h
@@ -134,9 +134,7 @@
       unsigned Pointer_AddressSpace;
       unsigned Struct_NumElements;
       unsigned Argument_Info;
-      // There is no default constructor in `ElementCount`, so we need
-      // to explicitly initialize this field with a value.
-      ElementCount Vector_Width = ElementCount::getFixed(0);
+      ElementCount Vector_Width;
     };
 
     enum ArgKind {
diff --git a/llvm/include/llvm/Support/TypeSize.h b/llvm/include/llvm/Support/TypeSize.h
--- a/llvm/include/llvm/Support/TypeSize.h
+++ b/llvm/include/llvm/Support/TypeSize.h
@@ -35,14 +35,12 @@
   ElementCount(unsigned Min, bool Scalable) : Min(Min), Scalable(Scalable) {}
 
 public:
-  /// No default constructor. Users should use one of the `get*`
-  /// static methods below, as they should always make a conscious
-  /// choice on the type of `ElementCount` they are requesting.
-  ElementCount() = delete;
   unsigned Min;  // Minimum number of vector elements.
   bool Scalable; // If true, NumElements is a multiple of 'Min' determined
                  // at runtime rather than compile time.
 
+  ElementCount() = default;
+
   ElementCount operator*(unsigned RHS) {
     return { Min * RHS, Scalable };
   }