[libc][math] Add tests and fix some issues with FTZ/DAZ modes. (#113744)

[libc] remove errno.h includes (#110934)

[libc][math] fix loose except check in `{EXPECT,ASSERT}_FP_EXCEPTION` macros (#88816)

Adds more FP test macros for the upcoming test adds for #61092 and the
issues opened from it: #88768, #88769, #

[libc][math] fix loose except check in `{EXPECT,ASSERT}_FP_EXCEPTION` macros (#88816)

Adds more FP test macros for the upcoming test adds for #61092 and the
issues opened from it: #88768, #88769, #88770, #88771, #88772.

Fix bug in `{EXPECT,ASSERT}_FP_EXCEPTION`. `EXPECT_FP_EXCEPTION(0)`
seems to be used to test that an exception did not happen, but it always
does `EXPECT_GE(... & 0, 0)` which never fails.

Update and refactor tests that break after the above bug fix. An
interesting way things broke after the above change is that
`ForceRoundingMode` and `quick_get_round()` were raising the inexact
exception, breaking a lot of the `atan*` tests.

The changes for all files other than `FPMatcher.h` and
`libc/test/src/math/smoke/RoundToIntegerTest.h` should have the same
semantics as before. For `RoundToIntegerTest.h`, lines 56-58 before the
changes do not always hold since this test is used for functions with
different exception and errno behavior like `lrint` and `lround`. I've
deleted those lines for now, but tests for those cases should be added
for the different nearest int functions to account for this.

Adding @nickdesaulniers for review.

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[libc] Add proxy header math_macros.h. (#87598)

Context: https://github.com/llvm/llvm-project/pull/87017

- Add proxy header `libc/hdr/math_macros.h` that will:
- include `<math.h>` in overlay mod

[libc] Add proxy header math_macros.h. (#87598)

Context: https://github.com/llvm/llvm-project/pull/87017

- Add proxy header `libc/hdr/math_macros.h` that will:
- include `<math.h>` in overlay mode,
- include `"include/llvm-libc-macros/math-macros.h"` in full build mode.
- Its corresponding CMake target `libc.hdr.math_macros` will only depend
on `libc.include.math` and `libc.include.llvm-libc-macros.math_macros`
in full build mode.
- Replace all `#include "include/llvm-libc-macros/math-macros.h"` with
`#include "hdr/math_macros.h"`.
- Add dependency to `libc.hdr.math_macros` CMake target when using
`add_fp_unittest`.
- Update the remaining dependency.
- Update bazel overlay: add `libc:hdr_math_macros` target, and replacing
all dependency on `libc:llvm_libc_macros_math_macros` with
`libc:hdr_math_macros`.

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[libc] Remove direct math.h includes (#85324)

Reland of #84991

A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. Thi

[libc] Remove direct math.h includes (#85324)

Reland of #84991

A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. This patch
replaces the last direct includes of math.h with our internal
math_macros.h, along with the necessary build system changes.

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[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is j

[libc] Move libc_errno inside of LIBC_NAMESPACE (#80774)

Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is just
moving libc_errno inside the namespace in tests. This isn't necessary in
the function implementations since those are already inside the
namespace.

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[libc][math][NFC] Remove global scope constants declaration in math tests (#69558)

Clean up usage of `DECLARE_SPECIAL_CONSTANTS` in global scope.

[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc][math] Extract non-MPFR math tests into libc-math-smoke-tests.

Extract non-MPFR math tests into libc-math-smoke-tests.

Reviewed By: sivachandra, jhuber6

Differential Revision: https://review

[libc][math] Extract non-MPFR math tests into libc-math-smoke-tests.

Extract non-MPFR math tests into libc-math-smoke-tests.

Reviewed By: sivachandra, jhuber6

Differential Revision: https://reviews.llvm.org/D159477

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