[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 skip reason: subject contains skip directive
Change-Id: Ia0119dff04bbfa079557d8ef584a33015a8a026b
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