Remove the AliasType::name() getter.

This CL removes the name() method from AliasType and replaces with
usages through the Symbol.

Change-Id: I50a85e4262e488adf935b9a484214fc85a966301
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/36781
Reviewed-by: Ben Clayton <bclayton@google.com>

src/ast/type/alias_type.h

@@ -39,8 +39,6 @@ class Alias : public Castable<Alias, Type> {
 
   /// @returns the alias symbol
   Symbol symbol() const { return symbol_; }
-  /// @returns the alias name
-  const std::string& name() const { return name_; }
   /// @returns the alias type
   Type* type() const { return subtype_; }
 

src/writer/hlsl/generator_impl.cc

@@ -238,7 +238,7 @@ bool GeneratorImpl::EmitConstructedType(std::ostream& out,
     // HLSL typedef is for intrinsic types only. For an alias'd struct,
     // generate a secondary struct with the new name.
     if (auto* str = alias->type()->As<ast::type::Struct>()) {
-      if (!EmitStructType(out, str, alias->name())) {
+      if (!EmitStructType(out, str, namer_->NameFor(alias->symbol()))) {
         return false;
       }
       return true;

src/writer/wgsl/generator_impl.cc

@@ -175,7 +175,7 @@ bool GeneratorImpl::GenerateEntryPoint(ast::PipelineStage stage,
 bool GeneratorImpl::EmitConstructedType(const ast::type::Type* ty) {
   make_indent();
   if (auto* alias = ty->As<ast::type::Alias>()) {
-    out_ << "type " << alias->name() << " = ";
+    out_ << "type " << module_.SymbolToName(alias->symbol()) << " = ";
     if (!EmitType(alias->type())) {
       return false;
     }
@@ -414,7 +414,7 @@ bool GeneratorImpl::EmitType(ast::type::Type* type) {
       return false;
     }
   } else if (auto* alias = type->As<ast::type::Alias>()) {
-    out_ << alias->name();
+    out_ << module_.SymbolToName(alias->symbol());
   } else if (auto* ary = type->As<ast::type::Array>()) {
     for (auto* deco : ary->decorations()) {
       if (auto* stride = deco->As<ast::StrideDecoration>()) {