[libc] Fix SPDX-License-Identifier file header comment typos (#122776)

[libc] implement the final macros for stdbit.h support (#84798)


Relevant sections of n3096:
- 7.18.1p1
- 7.18.2

[libc][stdbit] Add C tests for stdbit generic macros. (#84670)

Currently there is no tests for generic macros of generated `stdbit.h`
header in C, and it is easy to make typo mistakes as in
https:

[libc][stdbit] Add C tests for stdbit generic macros. (#84670)

Currently there is no tests for generic macros of generated `stdbit.h`
header in C, and it is easy to make typo mistakes as in
https://github.com/llvm/llvm-project/issues/84658. In this patch, we
add a simple test for them in C.

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[libc][stdbit][c23] adds implementation of `stdc_bit_ceil` functions (#84657)

Closes #84652.

Based on #84233.

[libc][stdbit] implement stdc_bit_floor (C23) (#84233)

[libc][stdbit] implement stdc_bit_width (C23) (#83892)

[libc][test] update constants used in stdbit test (#83893)

Either:
- I forgot my alphabet (that E comes before F).
- My juvenile inner brain finds unsigned literal constants with the sequence FU
f

[libc][test] update constants used in stdbit test (#83893)

Either:
- I forgot my alphabet (that E comes before F).
- My juvenile inner brain finds unsigned literal constants with the sequence FU
funny.

¿Por qué no los dos?

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[libc] Revert https://github.com/llvm/llvm-project/pull/83199 since it broke Fuchsia. (#83374)

With some header fix forward for GPU builds.

[libc] Add "include/" to the LLVM include directories (#83199)

Summary:
Recent changes added an include path in the float128 type that used the
internal `libc` path to find the macro. This doesn't w

[libc] Add "include/" to the LLVM include directories (#83199)

Summary:
Recent changes added an include path in the float128 type that used the
internal `libc` path to find the macro. This doesn't work once it's
installed because we need to search from the root of the install dir.
This patch adds "include/" to the include path so that our inclusion
of installed headers always match the internal use.

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[libc][stdbit] implement stdc_has_single_bit (C23) (#83168)

[libc][stdbit] implement stdc_count_ones (C23) (#82444)

[libc][stdbit] implement stdc_count_zeros (C23) (#82437)

[libc][stdbit] implement stdc_first_trailing_one (C23) (#81768)

[libc][stdbit] implement stdc_first_trailing_zero (C23) (#81526)

[libc][stdbit] implement stdc_first_leading_one (C23) (#81502)

[libc][stdbit] implement stdc_first_leading_zero (C23) (#81340)

[libc][stdbit] implement stdc_trailing_ones (C23) (#80459)

[libc][stdbit] implement stdc_trailing_zeros (C23) (#80344)

[libc][stdbit] fix return types (#80337)

All of the functions I've previously implemented return an unsigned int; not
the parameter type.

[libc] fix stdbit include test when not all entrypoints are available (#80323)

The intent of the test is to check that: 1. The type generic macros are
defined. 2. Those macros dispatch to the correc

[libc] fix stdbit include test when not all entrypoints are available (#80323)

The intent of the test is to check that: 1. The type generic macros are
defined. 2. Those macros dispatch to the correct underlying function.

The issue is that when new functionality is added to our stdbit.h without
rolling out the new entrypoint to all targets, this test breaks because our
generated stdbit.h will not contain declarations for the underlying function.
In that case, we should just declare the underlying functions first before
including our generated stdbit.h which just contains declarations. A definition
is a declaration, but redeclarations must match, hence the additions of
noexcept and extern "C".

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[libc] implement stdc_leading_ones (C23) (#80082)

[libc] implement stdc_leading_zeros_u* for stdbit.h (#79669)


- stdbit.stdc_leading_zeros_uc
- stdbit.stdc_leading_zeros_us
- stdbit.stdc_leading_zeros_ui
- stdbit.stdc_leading_zeros_ul
- stdbit.std

[libc] implement stdc_leading_zeros_u* for stdbit.h (#79669)


- stdbit.stdc_leading_zeros_uc
- stdbit.stdc_leading_zeros_us
- stdbit.stdc_leading_zeros_ui
- stdbit.stdc_leading_zeros_ul
- stdbit.stdc_leading_zeros_ull

Test via:
$ ninja libc-stdbit-tests libc_include_tests

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