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[libc] Add implementations of the remaining fenv functions.

Authored by sivachandra on Feb 15 2021, 10:36 PM.

Description

[libc] Add implementations of the remaining fenv functions.

Namely, implementations of fegetexceptfflag, fesetexceptflag,
fegetenv, fesetenv, feholdexcept and feupdateenv have been added.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D96935

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