MIPS64: Fix port of Refactor Map::ConstructionCount.
MIPS64: Fix port of Refactor Map::ConstructionCount.

Port 35ff259b6344eed116936372f6861181c6afe922.

BUG=

Review URL: https://codereview.chromium.org/756383005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25693}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh