[libc][NFC] Cleanup time.h (#122027)

While working on strftime I noticed some constants were being defined in
unexpected places. One thing led to another, and I ended up doing a
major cleanup of the

[libc][NFC] Cleanup time.h (#122027)

While working on strftime I noticed some constants were being defined in
unexpected places. One thing led to another, and I ended up doing a
major cleanup of the time functions.

What's included:
All uses of <time.h> in /src and /test removed (except for LibcTest.cpp)
The various time constants have been moved to time_constants.h, and the
`time_constants` namespace.
struct tm gets its own type indirection header now.

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[libc][NFC] Introduce a Sign type for FPBits (#78500)

Another patch is needed to cover `DyadicFloat` and `NormalFloat`
constructors.

[libc][NFC] Simplify `FPBits` (#76835)

This patch reduces the scope of `FPBits` exported variables and
functions.
It also moves storage up into `FPRep` and tries to make the default and
specializ

[libc][NFC] Simplify `FPBits` (#76835)

This patch reduces the scope of `FPBits` exported variables and
functions.
It also moves storage up into `FPRep` and tries to make the default and
specialized versions of `FPBits` more uniform.

The next step is to move the specialization from `FPBits` to `FPRep` so
we can manipulate floating point representations through `FPType`
alone - that is - independently from the host architecture.

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[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] Make ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matche

[libc] Make ErrnoSetterMatcher handle logging floating point values.

Along the way, couple of additional things have been done:

1. Move `ErrnoSetterMatcher.h` to `test/UnitTest` as all other matchers live
there now.
2. `ErrnoSetterMatcher` ignores matching `errno` on GPUs.

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D151129

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[libc][NFC] Switch use of errno in src/time and test/src/time to libc_errno.

Switch use of errno in src/time and test/src/time to libc_errno.

Reviewed By: sivachandra

Differential Revision: https:

[libc][NFC] Switch use of errno in src/time and test/src/time to libc_errno.

Switch use of errno in src/time and test/src/time to libc_errno.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D145192

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[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

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[libc] Add implementation of difftime function.

The difftime function computes the difference between two calendar
times: time1 - time0 as per as per 7.27.2.2 section in
http://www.open-std.org/jtc1

[libc] Add implementation of difftime function.

The difftime function computes the difference between two calendar
times: time1 - time0 as per as per 7.27.2.2 section in
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2478.pdf.

double difftime(time_t time1, time_t time0);

Tested:
Unit tests

Co-authored-by: Jeff Bailey <jeffbailey@google.com>

Reviewed By: jeffbailey

Differential Revision: https://reviews.llvm.org/D136631

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