[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 skip reason: subject contains skip directive
Change-Id: I7f4c24495e654dc6aff6d452118438c35af5226b
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