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[libc] Add implementation of few floating point manipulation functions.

Authored by sivachandra on Jun 2 2020, 2:04 PM.

Description

[libc] Add implementation of few floating point manipulation functions.

Implementations of copysign[f], frexp[f], logb[f], and modf[f] are added.

Reviewers: asteinhauser

Differential Revision: https://reviews.llvm.org/D81134