perf: reduce the number of debug impls in release builds

[nathanwhit]

Mostly an experiment, not sure it's worth the noise.

❯ bloaty --domain file target/release/deno -- ./deno-baseline
    FILE SIZE   
 -------------- 
  +200%      +8    [__LINKEDIT]
  -0.4%    -280    Rebase Info
  -0.0%    -368    __TEXT,__unwind_info
  -1.0%    -688    __TEXT,__literals
  -0.2%    -704    Function Start Addresses
  -0.1% -1.06Ki    Code Signature
  -0.1% -2.31Ki    __TEXT,__eh_frame
  -0.0% -4.00Ki    __TEXT,__const
 -23.0% -4.23Ki    [__TEXT]
  -0.2% -4.43Ki    __TEXT,__gcc_except_tab
 -79.5% -7.92Ki    [__DATA_CONST]
  -0.3% -8.08Ki    __DATA_CONST,__const
  -0.2% -10.1Ki    Symbol Table
  -0.2% -43.7Ki    String Table
  -0.1% -48.0Ki    __TEXT,__text
  -0.1%  -135Ki    TOTAL