[automerger skipped] DO NOT MERGE: [libc++] Add __truncating_cast for safely casting float types to integers am: 55b6136b3a am: 9546d85a3d am: c3a80bd37a -s ours am: f126b4ea11 -s ours
am: 9432e1044b
Change-Id: I119d98960f63fafb4f15c141b29dbc92d13cfd5b
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