perf: for loop and if

[petar-dambovaliev]

solves this

Benchmarks

Master
BenchmarkIfStatement-10    	     238	   4967960 ns/op
BenchmarkForLoop-10    	          649	   1771728 ns/op

Current branch
BenchmarkIfStatement-10    	     366	   3316189 ns/op
BenchmarkForLoop-10    	         1143	    945930 ns/op

By avoiding the runtime type conversion, we can see that we almost doubled the performance of these statements.

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.61%. Comparing base (0ba53ac) to head (7de4be3).

Files	Patch %	Lines
gnovm/pkg/gnolang/preprocess.go	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2140      +/-   ##
==========================================
- Coverage   54.63%   54.61%   -0.02%     
==========================================
  Files         581      582       +1     
  Lines       77544    78372     +828     
==========================================
+ Hits        42363    42804     +441     
- Misses      32023    32358     +335     
- Partials     3158     3210      +52     

Flag	Coverage Δ
gno.land	61.86% <ø> (ø)
gnovm	59.75% <95.83%> (-0.23%)	⬇️

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