Stop auto-generating AST code.

This moves all the previously auto-generated code into the normal
source tree, to be manually maintained going forward. It also removes
some additional refactoring scripts that were useful during the AST
rewrite, but are no longer needed now.

hilti/toolchain/CMakeLists.txt

@@ -17,10 +17,6 @@ bison_source(src/compiler/parser/driver.cc ${AUTOGEN_CC})
 bison_source(${AUTOGEN_CC}/__scanner.cc ${AUTOGEN_CC})
 bison_source(${AUTOGEN_CC}/__parser.cc ${AUTOGEN_CC})
 
-include(ASTOperators)
-
-autogen_operators(SOURCES_OPERATORS hilti src/ast/operators ${AUTOGEN_H} ${AUTOGEN_CC})
-
 set(SOURCES
     src/ast/ast-context.cc
     src/ast/attribute.cc

hilti/toolchain/include/ast/builder/builder.h

@@ -96,8 +96,8 @@ class Builder : public builder::NodeFactory {
         return statementDeclaration(declarationLocalVariable(std::move(id_), t, {}, std::move(m)));
     }
 
-    auto local(ID id_, ExpressionPtr init, Meta m = Meta()) {
-        return statementDeclaration(declarationLocalVariable(std::move(id_), std::move(init), std::move(m)));
+    auto local(ID id_, ExpressionPtr init, const Meta& m = Meta()) {
+        return statementDeclaration(declarationLocalVariable(std::move(id_), std::move(init), m));
     }
 
     auto local(ID id_, const QualifiedTypePtr& t, ExpressionPtr init, Meta m = Meta()) {
@@ -114,8 +114,8 @@ class Builder : public builder::NodeFactory {
     }
 
     auto global(ID id_, const ExpressionPtr& init, declaration::Linkage linkage = declaration::Linkage::Private,
-                Meta m = Meta()) {
-        return declarationGlobalVariable(std::move(id_), init, linkage, std::move(m));
+                const Meta& m = Meta()) {
+        return declarationGlobalVariable(std::move(id_), init, linkage, m);
     }
 
     auto global(ID id_, const QualifiedTypePtr& t, ExpressionPtr init,
@@ -558,8 +558,8 @@ class Builder : public builder::NodeFactory {
         block()->_add(context(), statementComment(std::move(comment), separator, m));
     }
 
-    void addReturn(ExpressionPtr e, Meta m = Meta()) {
-        block()->_add(context(), statementReturn(std::move(e), std::move(m)));
+    void addReturn(const ExpressionPtr& e, Meta m = Meta()) {
+        block()->_add(context(), statementReturn(e, std::move(m)));
     }
 
     void addReturn(const CtorPtr& c, const Meta& m = Meta()) {