Remove name property requirements from Attribute

Author: kyouko-taiga

Sources/LLVM/Function+Attributes.swift

@@ -223,7 +223,6 @@ public enum AttributeIndex: ExpressibleByIntegerLiteral, RawRepresentable {
 
 /// An LLVM attribute.
 public protocol Attribute {
-  var name: String { get }
   func asLLVM() -> LLVMAttributeRef
 }
 
@@ -239,11 +238,6 @@ public struct EnumAttribute: Attribute {
     return LLVMGetEnumAttributeKind(llvm)
   }
 
-  /// The name of the attribute's kind.
-  public var name: String {
-    return ""
-  }
-
   /// The value of the attribute.
   public var value: UInt64 {
     return LLVMGetEnumAttributeValue(llvm)