[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
am: 19ac1353b7 -s ours
am skip reason: subject contains skip directive
Change-Id: Ic5b0d9db8d85f1b4c7a01e46b80b97eb0ead2dcd
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