repl: dump context ret join by comma

[visualfc]

>>> println("hello world")
hello world
12,<nil>
>>> fn := func(a int,b int) (int,int) { return a+b,a*b}
>>> fn(10,20)
30,200
>>> 

[codecov-commenter]

Codecov Report

Merging #527 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
+ Coverage   89.54%   89.56%   +0.02%     
==========================================
  Files          40       40              
  Lines        9922     9922              
==========================================
+ Hits         8885     8887       +2     
+ Misses        762      760       -2     
  Partials      275      275              

Impacted Files	Coverage Δ
exec/bytecode/goinstr.go	93.40% <0.00%> (+0.52%)	⬆️

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