c1 getObjectSize intrinsic should guard round mask constant

The issue was found during the test of arm32 (see JDK-8279300). getObjectSize intrinsic generates logic_and operation with constant that is not acceptable by arm32 instruction.
1412 │ #else
1413 │ __ add(length_int, header_size, length_int);
1414 │ if (round_mask != 0) {
1415 │ __ logical_and(length_int, LIR_OprFact::intConst(~round_mask), length_int); // <<------ ~round mask (-8) can't be encoded into and instruction
1416 │ }
1417 │ __ convert(Bytecodes::_i2l, length_int, result_reg);
1418 │ #endif

Hence for arm32 the constant should be preloaded to a register by separate instruction. Suggest fix is a safer way to generate AND op, it still allows to encode the mask into instruction where it is possible (x86?), and generate load instruction for other platforms.
  __ add(length_int, header_size, length_int);
  if (round_mask != 0) {
    // generate LIR_Const if mask fits instruction requirement
    LIR_Opr round_mask_opr = load_immediate((~round_mask), T_INT);
    __ logical_and(length_int, round_mask_opr, length_int);
  }
  __ convert(Bytecodes::_i2l, length_int, result_reg);