[PATCH] Prototype patch to support <math.h> as a conforming C++ header in addition to <cmath>.

[Chandler Carruth]

Hi mclow.lists, rsmith,

This extracts the conformance fixing aspects of <cmath> (replacing macros with
inline functions) into a <math.h> which wraps the system <math.h>.

This should have no functionality change for <cmath> but will cause
includes of <math.h> to be modular and place nicely in C++ code using
libc++.

Clearly this isn't ready to commit -- it doesn't have a synopsis and I would
rather fix all of the related <cfoo> headers in a single patch, but it should
at least clarify the nature of the approach.

http://reviews.llvm.org/D8323

Files:
  include/cmath
  include/math.h

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