Remove all non-function-name uses of CONST_LEGACY

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 8a503301484ee0f91e6901cbaf6d469306faa94f..4d97fc249b3499267b25229a1dd8c0b1beaef773 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -598,7 +598,7 @@ class ImportDeclaration final : public Declaration {
   ImportDeclaration(Zone* zone, VariableProxy* proxy,
                     const AstRawString* import_name,
                     const AstRawString* module_specifier, Scope* scope, int pos)
-      : Declaration(zone, proxy, IMPORT, scope, pos),
+      : Declaration(zone, proxy, CONST, scope, pos),
         import_name_(import_name),
         module_specifier_(module_specifier) {}