A DESCRIPTION OF THE PROBLEM :
The initial CodeBuffer layout is depicted in file src/hotspot/share/asm/codeBuffer.cpp as below, and the order is code, stubs and constants.
```
// The structure of the CodeBuffer while code is being accumulated:
//
// _total_start -> \
// _insts._start -> +----------------+
// | |
// | Code |
// | |
// _stubs._start -> |----------------|
// | |
// | Stubs | (also handlers for deopt/exception)
// | |
// _consts._start -> |----------------|
// | |
// | Constants |
// | |
// +----------------+
// + _total_size -> | |

After JKD-6961697, constants section was moved to the front of code section, but this layout was not updated correspondingly, which is misunderstanding. Therefore, we'd better to fix it.