Stop emitting whitespace for dictionary definitions in codegen

kernel/modelverse_jit/tree_ir.py

@@ -641,7 +641,7 @@ class DictionaryLiteralInstruction(Instruction):
 
     def generate_dictionary_expr(self, code_generator):
         """Generates an expression that creates this dictionary."""
-        return '{ %s }' % ', '.join(
+        return '{%s}' % ', '.join(
             ['%s : %s' % (
                 key.generate_python_use(code_generator),
                 val.generate_python_use(code_generator))