`NODE_ZSUPER` from deeply nested blocks will result in a truncated digits for block index in `OP_ARGARY`

[dearblue]

• Good case : Calling super from a 15-level lambda

  % bin/mruby -vce 'def m(a, b, c); ->{->{->{->{->{->{->{->{->{->{->{->{->{->{->{ super }}}}}}}}}}}}}}}; end'
  
  ...SNIP...
  
  irep 0x220d1d869550 nregs=6 nlocals=2 pools=0 syms=0 reps=0 ilen=13
  file: -e
      1 000 ENTER         0:0:0:0:0:0:0 (0x0)
      1 004 ARGARY        R3      3:0:0:0 (15)    ### see "(15)" (good) ###
      1 008 SUPER         R2      n=*
      1 011 RETURN        R2
  
  Syntax OK

• Wrong case : Calling super from a 17-level lambda

  % bin/mruby -vce 'def m(a, b, c); ->{->{->{->{->{->{->{->{->{->{->{->{->{->{->{->{->{ super }}}}}}}}}}}}}}}}}; end'
  
  ...SNIP...
  
  irep 0x32923e8695f0 nregs=6 nlocals=2 pools=0 syms=0 reps=0 ilen=13
  file: -e
      1 000 ENTER         0:0:0:0:0:0:0 (0x0)
      1 004 ARGARY        R3      3:0:0:0 (1)     ### see "(1)" (overflowed) ###
      1 008 SUPER         R2      n=*
      1 011 RETURN        R2
  
  Syntax OK

😸 The strongest solution I have come up with is to call codegen_error(s, "too complex expression") if the number exceeds 15.

There may be a better solution, so I'm just reporting it for now.

[dearblue]

I reported it wrong.
There was no problem with NODE_SUPER, only with NODE_ZSUPER.
https://github.com/mruby/mruby/blob/86f620822f9ebe6577a3ecb2b0273a0fbbfc1cb6/mrbgems/mruby-compiler/core/codegen.c#L3062C52-L3062C62

However, I found the same problem with NODE_YIELD which generates OP_BLKPUSH.
https://github.com/mruby/mruby/blob/86f620822f9ebe6577a3ecb2b0273a0fbbfc1cb6/mrbgems/mruby-compiler/core/codegen.c#L3133C51-L3133C61

[matz]

Only thing we can do is detect too deep nesting error.