opt: encoder VM

[AsterDY]

Optimizations

• append chars instead of string
• use std strconv.AppendInt() instead of native I64toa
• force inline call_xx_marshaler()
• asm2arm: use dynamic PC-relative offset JUMP to replace CALL

[codecov-commenter]

Codecov Report

Attention: 44 lines in your changes are missing coverage. Please review.

Comparison is base (820917d) 61.58% compared to head (ed746bd) 61.80%.

Files	Patch %	Lines
internal/encoder/vm/vm.go	2.56%	38 Missing ⚠️
internal/encoder/alg/spec.go	0.00%	6 Missing ⚠️

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Additional details and impacted files

@@               Coverage Diff                @@
##           test/aarch64     #593      +/-   ##
================================================
+ Coverage         61.58%   61.80%   +0.22%     
================================================
  Files                84       84              
  Lines             10363    10345      -18     
================================================
+ Hits               6382     6394      +12     
+ Misses             3597     3568      -29     
+ Partials            384      383       -1     

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