[dwds] pass --enable-experiment flags to the expression compiler worker

[annagrin]

Currently expression compiler does not get this argument even if it is passed to the original compilation:

[FINEST] ExpressionCompilerService: Failed to compile "(true, 3)": org-dartlang-debug:synthetic_debug_expression:1:1: Error: This requires the experimental 'records' language feature to be enabled.
Try passing the '--enable-experiment=records' command line option.
(true, 3)
^
CompilationError: This requires the experimental 'records' language feature to be enabled.
Try passing the '--enable-experiment=records' command line option.
(true, 3)
^

[annagrin]

Closed in #1794