Revert "[OpenMP][Clang] Support for target math functions"

This commit appears to be breaking stage-2 builds on GreenDragon. The
OpenMP wrappers for cmath and math.h are copied into the root of the
resource directory and cause a cyclic dependency in module 'Darwin':
Darwin -> std -> Darwin. This blows up when CMake is testing for modules
support and breaks all stage 2 module builds, including the ThinLTO bot
and all LLDB bots.

CMake Error at cmake/modules/HandleLLVMOptions.cmake:497 (message):
  LLVM_ENABLE_MODULES is not supported by this compiler

llvm-svn: 360192

3 files changed, 0 insertions, 80 deletions

diff --git a/clang/lib/Headers/openmp_wrappers/__clang_openmp_math.h b/clang/lib/Headers/openmp_wrappers/__clang_openmp_math.h
deleted file mode 100644
index 2f7e5c3ead5..00000000000
--- a/clang/lib/Headers/openmp_wrappers/__clang_openmp_math.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*===---- __clang_openmp_math.h - OpenMP target math support ---------------===
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
- *===-----------------------------------------------------------------------===
- */
-
-#if defined(__NVPTX__) && defined(_OPENMP)
-/// TODO:
-/// We are currently reusing the functionality of the Clang-CUDA code path
-/// as an alternative to the host declarations provided by math.h and cmath.
-/// This is suboptimal.
-///
-/// We should instead declare the device functions in a similar way, e.g.,
-/// through OpenMP 5.0 variants, and afterwards populate the module with the
-/// host declarations by unconditionally including the host math.h or cmath,
-/// respectively. This is actually what the Clang-CUDA code path does, using
-/// __device__ instead of variants to avoid redeclarations and get the desired
-/// overload resolution.
-
-#define __CUDA__
-
-#if defined(__cplusplus)
-  #include <__clang_cuda_math_forward_declares.h>
-  #include <stdlib.h>
-#else
-  #include <stddef.h>
-#endif
-
-/// Include declarations for libdevice functions.
-#include <__clang_cuda_libdevice_declares.h>
-/// Provide definitions for these functions.
-#include <__clang_cuda_device_functions.h>
-
-#if defined(__cplusplus)
-  #include <__clang_cuda_cmath.h>
-#endif
-
-#undef __CUDA__
-
-/// Magic macro for stopping the math.h/cmath host header from being included.
-#define __CLANG_NO_HOST_MATH__
-
-#endif
-
diff --git a/clang/lib/Headers/openmp_wrappers/cmath b/clang/lib/Headers/openmp_wrappers/cmath
deleted file mode 100644
index a5183a1d8d1..00000000000
--- a/clang/lib/Headers/openmp_wrappers/cmath
+++ /dev/null
@@ -1,16 +0,0 @@
-/*===-------------- cmath - Alternative cmath header -----------------------===
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
- *===-----------------------------------------------------------------------===
- */
-
-#include <__clang_openmp_math.h>
-
-#ifndef __CLANG_NO_HOST_MATH__
-#include_next <cmath>
-#else
-#undef __CLANG_NO_HOST_MATH__
-#endif
diff --git a/clang/lib/Headers/openmp_wrappers/math.h b/clang/lib/Headers/openmp_wrappers/math.h
deleted file mode 100644
index d2786ecb242..00000000000
--- a/clang/lib/Headers/openmp_wrappers/math.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/*===------------- math.h - Alternative math.h header ----------------------===
- *
- * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
- * See https://llvm.org/LICENSE.txt for license information.
- * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- *
- *===-----------------------------------------------------------------------===
- */
-
-#include <__clang_openmp_math.h>
-
-#ifndef __CLANG_NO_HOST_MATH__
-#include_next <math.h>
-#else
-#undef __CLANG_NO_HOST_MATH__
-#endif
-