Revert "[libc][math][c23] Implement C23 math function asinpif16" (llvm#150756)

Reverts llvm#146226

The MPFR test uses `mpfr_asinpi` which requires MPFR 4.2.0 or later, but
the Buildbots are running an older version of MPFR.

See https://lab.llvm.org/buildbot/#/builders/104/builds/27743 for
example.

I said I was going to revert the PR until we have a workaround for older
versions of MPFR, but then I forgot and I just disabled the entrypoints
which doesn't fix the Buildbot builds.

Author: overmighty

libc/config/linux/aarch64/entrypoints.txt

@@ -660,7 +660,6 @@ if(LIBC_TYPES_HAS_FLOAT16)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # math.h C23 _Float16 entrypoints
     # libc.src.math.acoshf16
-    libc.src.math.asinpif16
     libc.src.math.canonicalizef16
     libc.src.math.ceilf16
     libc.src.math.copysignf16

libc/config/linux/x86_64/entrypoints.txt

@@ -703,7 +703,6 @@ if(LIBC_TYPES_HAS_FLOAT16)
     libc.src.math.acospif16
     libc.src.math.asinf16
     libc.src.math.asinhf16
-    libc.src.math.asinpif16
     libc.src.math.atanf16
     libc.src.math.atanhf16
     libc.src.math.canonicalizef16

libc/docs/headers/math/index.rst

@@ -259,7 +259,7 @@ Higher Math Functions
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | asinh     | |check|          |                 |                        | |check|              |                        | 7.12.5.2               | F.10.2.2                   |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
-| asinpi    |                  |                 |                        | |check|              |                        | 7.12.4.9               | F.10.1.9                   |
+| asinpi    |                  |                 |                        |                      |                        | 7.12.4.9               | F.10.1.9                   |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+
 | atan      | |check|          | 1 ULP           |                        | |check|              |                        | 7.12.4.3               | F.10.1.3                   |
 +-----------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+----------------------------+

libc/include/math.yaml

@@ -79,13 +79,6 @@ functions:
     arguments:
       - type: _Float16
     guard: LIBC_TYPES_HAS_FLOAT16
-  - name: asinpif16
-    standards:
-      - stdc
-    return_type: _Float16
-    arguments:
-      - type: _Float16
-    guard: LIBC_TYPES_HAS_FLOAT16
   - name: atan
     standards:
       - stdc

libc/src/math/CMakeLists.txt

@@ -58,8 +58,6 @@ add_math_entrypoint_object(asinh)
 add_math_entrypoint_object(asinhf)
 add_math_entrypoint_object(asinhf16)
 
-add_math_entrypoint_object(asinpif16)
-
 add_math_entrypoint_object(atan)
 add_math_entrypoint_object(atanf)
 add_math_entrypoint_object(atanf16)

libc/src/math/asinpif16.h

@@ -3918,25 +3918,6 @@ add_entrypoint_object(
     libc.src.__support.macros.properties.types
 )
 
-add_entrypoint_object(
-  asinpif16
-  SRCS
-    asinpif16.cpp
-  HDRS
-    ../asinpif16.h
-  DEPENDS
-    libc.hdr.errno_macros
-    libc.hdr.fenv_macros
-    libc.src.__support.FPUtil.cast
-    libc.src.__support.FPUtil.except_value_utils
-    libc.src.__support.FPUtil.fenv_impl
-    libc.src.__support.FPUtil.fp_bits
-    libc.src.__support.FPUtil.multiply_add
-    libc.src.__support.FPUtil.polyeval
-    libc.src.__support.FPUtil.sqrt
-    libc.src.__support.macros.optimization
-)
-
 add_entrypoint_object(
   atanhf
   SRCS

libc/src/math/generic/CMakeLists.txt

@@ -2282,17 +2282,6 @@ add_fp_unittest(
     libc.src.math.asinf16  
 )
 
-add_fp_unittest(
-  asinpif16_test
-  NEED_MPFR
-  SUITE
-    libc-math-unittests
-  SRCS
-    asinpif16_test.cpp
-  DEPENDS
-    libc.src.math.asinpif16
-)
-
 add_fp_unittest(
   acosf_test
   NEED_MPFR