Add missing Float16Array constructors

These 2 constructor overloads appear to be missing.
You can find similar overloads for other typed array constructors in `es6.d.ts`

Author: greggman

src/lib/esnext.float16.d.ts

@@ -356,6 +356,8 @@ interface Float16ArrayConstructor {
     new (length?: number): Float16Array<ArrayBuffer>;
     new (array: ArrayLike<number> | Iterable<number>): Float16Array<ArrayBuffer>;
     new <TArrayBuffer extends ArrayBufferLike = ArrayBuffer>(buffer: TArrayBuffer, byteOffset?: number, length?: number): Float16Array<TArrayBuffer>;
+    new (buffer: ArrayBuffer, byteOffset?: number, length?: number): Float16Array<ArrayBuffer>;
+    new (array: ArrayLike<number> | ArrayBuffer): Float16Array<ArrayBuffer>;
 
     /**
      * The size in bytes of each element in the array.
@@ -423,3 +425,4 @@ interface DataView<TArrayBuffer extends ArrayBufferLike> {
      */
     setFloat16(byteOffset: number, value: number, littleEndian?: boolean): void;
 }
+

tests/cases/compiler/typedArrayConstructorOverloads.ts

@@ -12,6 +12,7 @@ type TypedArrayConstructor =
     | Uint16ArrayConstructor
     | Int32ArrayConstructor
     | Uint32ArrayConstructor
+    | Float16ArrayConstructor
     | Float32ArrayConstructor
     | Float64ArrayConstructor
     | BigInt64ArrayConstructor