[vala] (43 commits) Created branch wip/effectfree

[Luca Bruno <lucabru src gnome org>]

The branch 'wip/effectfree' was created.

Summary of new commits:

  ec17434... codegen: Use get_parameter_cvalue in return_out_parameter
  49586b8... GAsync: Push method symbol only when needed when generating
  53c901d... Emit left-handed side of assignment when it's a field or pa
  b272397... codegen: Use lvalue of the assignment when emitting array a
  1460cfe... codegen: Unset array_size_cvalue in load_variable
  05c3221... Add get_defined_variables in PostfixExpression
  1cad7b6... Set parent_node of the expression of delete statements
  4b730a2... Set parent_node of the postfix inner expression
  b9b4b8f... Set lvalue to the inner expression of address-of expression
  0e945de... Set lvalue to inner expression of method call that returns 
  d52d322... Set lvalue to inner member access having type non-nullable 
  10b61eb... Set lvalue to inner expression when accessing array length 
  514be4d... codegen: Cleanup emit_temp_var
  e9825ca... codegen: Add create_temp_value, load_temp_value and store_t
  70a3a33... Don't set target_value of assignment if parent is an expres
  4191a0a... Add actual_value_type to TargetValue
  ca11c09... codegen: Use temporary variables when accessing a variable
  2309d12... codegen: Use temporary variables when accessing a property
  d3136fa... codegen: Make transform_value be effect-free
  2fb2f40... codegen: Make copy_value be effect-free
  13ecc59... codegen: Drop useless temporary variable in array creation
  25d4bca... codegen: Drop useless temporary variable in simple assignme
  1b7fc60... codegen: Cleanup simple assignment
  7b0759b... codegen: Drop useless temporary variables when storing a pr
  b75f9b9... codegen: Drop useless temp variable when accessing base met
  d0f3bfb... codegen: Drop useless temporary variable in visit_cast_expr
  3ba7fcd... codegen: Simplify emit of postfix expression
  6cb7e23... codegen: Use create_temp_value in struct initializer
  3b4f72e... codegen: Use create_temp_value in visit_object_creation_exp
  21bd7c5... codegen: Use store_temp_value in visit_reference_transfer_e
  9df586d... codegen: Use create_temp_value in visit_binary_expression
  c1a44b2... codegen: Use create_temp_value in handle_struct_argument
  0caa6f9... codegen: Use create_temp_value in try_cast_value_to_type
  167a253... codegen: Use create_temp_value in store_property
  1b36bd5... codegen: Use create_temp_value in visit_string_switch_state
  86b0467... codegen: Use store_temp_value in visit_return_statement
  4ef803f... codegen: Replace temp_ref_vars with temp_ref_values using T
  4fd9a84... codegen: Use create_temp_value in copy_value of array modul
  61f2974... codegen: Use create_temp_value in copy_value
  59eef8f... codegen: Use create_temp_value in try_cast_variant_to_type
  3bdfb4b... codegen: Use store_temp_value in visit_end_full_expression
  8cff869... codegen: Add lvalue field to GLibValue
  54333e8... codegen: Use GLibValue.lvalue when taking the address of an