[Merged by Bors] - Return the correct value from a statement list

[raskad]

When compiling a statement list we need to make sure that the last expression that returns a value is compiled with the use_expr flag. Currently we set use_expr on the last statement of the statement list. This leads to incorrect returns when the last statement does not return a value. This PR fixes this by looking up the last value returning expression in a statement list and setting the use_expr appropriately.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	94,205	94,205	0
Passed	70,624	70,632	+8
Ignored	18,622	18,622	0
Failed	4,959	4,951	-8
Panics	0	0	0
Conformance	74.97%	74.98%	+0.01%

Fixed tests (8):

test/language/statements/variable/cptn-value.js [strict mode] (previously Failed)
test/language/statements/variable/cptn-value.js (previously Failed)
test/language/statements/const/cptn-value.js [strict mode] (previously Failed)
test/language/statements/const/cptn-value.js (previously Failed)
test/language/statements/class/cptn-decl.js [strict mode] (previously Failed)
test/language/statements/class/cptn-decl.js (previously Failed)
test/language/statements/let/cptn-value.js [strict mode] (previously Failed)
test/language/statements/let/cptn-value.js (previously Failed)

[codecov]

Codecov Report

Merging #2554 (70ca9d4) into main (f19467a) will increase coverage by 0.29%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main    #2554      +/-   ##
==========================================
+ Coverage   49.99%   50.28%   +0.29%     
==========================================
  Files         379      373       -6     
  Lines       37642    37423     -219     
==========================================
  Hits        18819    18819              
+ Misses      18823    18604     -219     

Impacted Files	Coverage Δ
boa_engine/src/bytecompiler/mod.rs	57.72% <40.00%> (-0.39%)	⬇️
boa_engine/src/vm/mod.rs	48.75% <0.00%> (-1.00%)	⬇️
boa_gc/src/cell.rs	58.75% <0.00%> (-0.57%)	⬇️
boa_examples/src/bin/symbol_visitor.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/commuter_visitor.rs	0.00% <0.00%> (ø)
boa_examples/src/bin/jsdate.rs
boa_examples/src/bin/jsregexp.rs
boa_examples/src/bin/loadfile.rs
boa_examples/src/bin/modulehandler.rs
boa_examples/src/bin/jstypedarray.rs
... and 1 more

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[jedel1043]

Nice!

[jedel1043]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

• Build and Test (macos-latest)
• Build and Test (windows-latest)
• Coverage
• Misc