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This tiny patch improves the compile time of flatten-heavy programs by 1-2%, by adding two bangs. Addresses (somewhat) #18502 This reduces allocation by T9872b -1.1% T9872d -3.3% T5321Fun -0.2% T5631 -0.2% T5837 +0.1% T6048 +0.1% Metric Decrease: T9872b T9872d
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