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Fixed SyntaxError when obfuscating a class that extends a boolean literal#1420
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class C extends true {}is valid JavaScript, butBooleanLiteralTransformerrewrotetrue/falseinto!![]/![]even in theextendsposition, emittingclass C extends ![] {}. A class heritage must be aLeftHandSideExpression, so that causes an earlySyntaxError. I skip the transformation when the literal is the classsuperClassand leave it unchanged; booleans everywhere else are still transformed as before. Added a regression test (it fails without the fix and passes with it).Fixes #1131