[automerger skipped] DO NOT MERGE: [libc++] Move __clamp_to_integral to <cmath>, and harden against min()/max() macros am: 280d459517 -s ours am: 2a6b690b1d -s ours am: 00305f086b am: 6bda858567
am: 1f6fdc4fc8
Change-Id: I56ce2334817e511694a10c13e82d32c4d839a65d
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