AST: Remove AvailableAttr::platformString().

Author: tshortli

include/swift/AST/Attr.h

@@ -817,11 +817,6 @@ class AvailableAttr : public DeclAttribute {
   /// platform.
   bool hasPlatform() const { return getPlatform() != PlatformKind::none; }
 
-  /// Returns the string for the platform of the attribute.
-  StringRef platformString() const {
-    return swift::platformString(getPlatform());
-  }
-
   /// Returns the human-readable string for the platform of the attribute.
   StringRef prettyPlatformString() const {
     return swift::prettyPlatformString(getPlatform());

lib/AST/Attr.cpp

@@ -1172,21 +1172,20 @@ bool DeclAttribute::printImpl(ASTPrinter &Printer, const PrintOptions &Options,
   }
 
   case DeclAttrKind::Available: {
-    auto Attr = cast<AvailableAttr>(this);
-    auto SemanticAttr = D->getSemanticAvailableAttr(Attr);
-    if (!SemanticAttr)
+    auto Attr = D->getSemanticAvailableAttr(cast<AvailableAttr>(this));
+    if (!Attr)
       return false;
 
     if (Options.printPublicInterface() && Attr->isSPI()) {
-      assert(Attr->hasPlatform());
-      assert(Attr->Introduced.has_value());
+      assert(Attr->isPlatformSpecific());
+      assert(Attr->getIntroduced().has_value());
       Printer.printAttrName("@available");
       Printer << "(";
-      Printer << Attr->platformString();
+      Printer << Attr->getDomain().getNameForAttributePrinting();
       Printer << ", unavailable)";
       break;
     }
-    if (Attr->isForEmbedded()) {
+    if (Attr->getParsedAttr()->isForEmbedded()) {
       std::string atUnavailableInEmbedded =
           (llvm::Twine("@") + UNAVAILABLE_IN_EMBEDDED_ATTRNAME).str();
       Printer.printAttrName(atUnavailableInEmbedded);
@@ -1200,7 +1199,7 @@ bool DeclAttribute::printImpl(ASTPrinter &Printer, const PrintOptions &Options,
       Printer.printAttrName("@available");
     }
     Printer << "(";
-    printAvailableAttr(D, *SemanticAttr, Printer, Options);
+    printAvailableAttr(D, *Attr, Printer, Options);
     Printer << ")";
     break;
   }