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move a * (1 << b) -> a << b pattern from fold-const.c to match.pd


Hi,
The attached patch moves pattern a * (1 << b) -> a << b.
Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
OK for trunk if testing passes ?

Thank you,
Prathamesh

Attachment: ChangeLog.txt
Description: Text document

Attachment: patch.txt
Description: Text document


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