[Merged by Bors] - Cleanup vm stack on function return

[raskad]

This cleans up the vm stack on a function return. This is needed because when errors are thrown, there may be still values on the stack that cannot be cleaned up via regular control flow. The change should have little performance impact, because the Vec::truncate function does not alter the capacity of the vector.

[codecov]

Codecov Report

Merging #1880 (5737cd9) into main (3fe7d09) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1880      +/-   ##
==========================================
+ Coverage   46.71%   46.73%   +0.01%     
==========================================
  Files         204      204              
  Lines       16732    16734       +2     
==========================================
+ Hits         7817     7821       +4     
+ Misses       8915     8913       -2     

Impacted Files	Coverage Δ
boa_engine/src/vm/mod.rs	70.79% <100.00%> (+0.08%)	⬆️
boa_engine/src/builtins/number/mod.rs	77.77% <0.00%> (+0.76%)	⬆️

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[Razican]

Test262 conformance changes

VM implementation

Test result	main count	PR count	difference
Total	88,342	88,342	0
Passed	43,039	43,041	+2
Ignored	21,413	21,413	0
Failed	23,890	23,888	-2
Panics	0	0	0
Conformance	48.72%	48.72%	+0.00%

Fixed tests (2):

test/language/statements/try/completion-values-fn-finally-return.js [strict mode] (previously Failed)
test/language/statements/try/completion-values-fn-finally-return.js (previously Failed)

[raskad]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

• Clippy
• Documentation
• Examples
• Rustfmt
• Tests on Linux
• Tests on MacOS
• Tests on Windows