`Xmir.toPhi` method takes unreasonable amount of time

[volodya-lombrozo]

Xmir.toPhi method takes unreasonable amount of time to transform XMIR files to PHI expressions.

The most problematic line is here:

eo/eo-parser/src/main/java/org/eolang/parser/Xmir.java

Line 240 in d063ff7

return new Xnav(new Xsline(train).pass(this.xml).inner())

Particularly new Xsline(train).pass(this.xml).

Here is profiling results:

flamegraph-phi-unphi-90391.html.txt

[maxonfjvipon]

@yegor256 let's make a new release with tag 0.51.3

[yegor256]

@rultor release, tag is 0.51.3

[rultor]

@rultor release, tag is 0.51.3

@yegor256 OK, I will release it now. Please check the progress here.

[rultor]

@rultor release, tag is 0.51.3

@yegor256 Done! FYI, the full log is here (took me 9min).