Senran Zhang df4e0beaeb [NFC][ConstantFold] Check getAggregateElement before getSplatValue call ...

Constant::getSplatValue has O(N) time complexity in the worst case,
where N is the # of elements in a vector. So we call
Constant::getAggregateElement first and return earlier if possible to
avoid unnecessary getSplatValue calls.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D107252

2021-08-03 21:52:14 -07:00

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