The js_expected_symbol_test implementation extracts symbols names
from a rollup iife bundle. Previously, it only handled the case
with a simple 'var bundle = ...;' statement.
Sometimes, rollup produces a more complex bundle, where the 'bundle'
variable is not the only top-level variable declared in the same
declaration statement. This commit patches the symbol exctractor
to support this more complex case.
Additionally, when the symbol test fails, it prints a command to
accept the symbol diff. This command needs to include the
--define=compile flag to ensure the diff is applied in the same
compile mode as the test was run.
PR Close#24677
Misko Hevery
Alex Rickabaugh