Compiler inlining fixes

[roman-khimov]

Problem

This simple code:

// OracleCallback is called by Oracle contract when the request is finished.
func OracleCallback(url []byte, data []byte, code int, res []byte) {
        if code != 0 {
                panic("oracle request failed for " + string(url) + " with " + std.Itoa(code, 10))
        }
        runtime.Log("oracle result for " + string(url) + ":" + string(res))
}

Fails with

error encountered at instruction 1 (SYSCALL): error during call from native: error encountered at instruction 205 (STLOC2): runtime error: index out of range [2] with length 2

Which means that the code generated is just plain wrong because it initializes two local slots and then uses all three of them.

Solution

#1878 would be a better one, but this one suffices for now.

[codecov]

Codecov Report

Merging #1880 (7e9f8e0) into master (dbcd628) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1880      +/-   ##
==========================================
+ Coverage   83.02%   83.09%   +0.07%     
==========================================
  Files         286      286              
  Lines       22693    22692       -1     
==========================================
+ Hits        18840    18856      +16     
+ Misses       2664     2645      -19     
- Partials     1189     1191       +2     

Impacted Files	Coverage Δ
pkg/compiler/func_scope.go	100.00% <ø> (ø)
pkg/consensus/consensus.go	70.21% <0.00%> (-0.61%)	⬇️
pkg/network/server.go	70.94% <0.00%> (+0.14%)	⬆️
pkg/services/oracle/request.go	55.64% <0.00%> (+4.83%)	⬆️
pkg/services/oracle/oracle.go	90.69% <0.00%> (+11.62%)	⬆️
pkg/network/metrics/metrics.go	81.81% <0.00%> (+18.18%)	⬆️

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