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

1 files changed, 0 insertions, 15 deletions

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 91cc30520f7..cbaf5cbf926 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -1151,21 +1151,6 @@ void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
   if (JA.isOffloading(Action::OFK_Cuda))
     getToolChain().AddCudaIncludeArgs(Args, CmdArgs);
 
-  // If we are offloading to a target via OpenMP we need to include the
-  // openmp_wrappers folder which contains alternative system headers.
-  if (JA.isDeviceOffloading(Action::OFK_OpenMP) &&
-      getToolChain().getTriple().isNVPTX()){
-    if (!Args.hasArg(options::OPT_nobuiltininc)) {
-      // Add openmp_wrappers/* to our system include path.  This lets us wrap
-      // standard library headers.
-      SmallString<128> P(D.ResourceDir);
-      llvm::sys::path::append(P, "include");
-      llvm::sys::path::append(P, "openmp_wrappers");
-      CmdArgs.push_back("-internal-isystem");
-      CmdArgs.push_back(Args.MakeArgString(P));
-    }
-  }
-
   // Add -i* options, and automatically translate to
   // -include-pch/-include-pth for transparent PCH support. It's
   // wonky, but we include looking for .gch so we can support seamless