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Reduce memory consumption of coverage dumps

Authored by serge-sans-paille on Jun 4 2019, 11:35 PM.

Description

Reduce memory consumption of coverage dumps

Avoiding an intermediate join operation removes the need for an
intermediate buffer that may be quite large, as showcased by

https://bugs.llvm.org/show_bug.cgi?id=41965

Differential Revision: https://reviews.llvm.org/D62623

llvm-svn: 362584