[NDS32] No need to take padding into consideration in Andes ABI2 because we can...

[NDS32] No need to take padding into consideration in Andes ABI2 because we can...

[NDS32] No need to take padding into consideration in Andes ABI2 because
        we can pass arguments in registers for variadic function.

  -- By default GCC uses must_pass_in_stack_var_size_or_pad for TARGET_MUST_PASS_IN_STACK.
     For Andes ABI2, the data layout in memory will be incorrect when calling variadic function
     under big-endian configuration.

	* config/nds32/nds32.c (nds32_must_pass_in_stack): New implementation
	for TARGET_MUST_PASS_IN_STACK.

From-SVN: r214869