Revert "[Libomptarget] Add RPC-based printf implementation for OpenMP (#85638)"

This reverts commit 2cf8118.

Failing tests, revert until I can fix it

Author: jhuber6

openmp/libomptarget/DeviceRTL/CMakeLists.txt

@@ -122,11 +122,6 @@ set(clang_opt_flags -O3 -mllvm -openmp-opt-disable -DSHARED_SCRATCHPAD_SIZE=512
 set(link_opt_flags  -O3        -openmp-opt-disable -attributor-enable=module -vectorize-slp=false )
 set(link_export_flag -passes=internalize -internalize-public-api-file=${source_directory}/exports)
 
-# If the user built with the GPU C library enabled we will use that instead.
-if(${LIBOMPTARGET_GPU_LIBC_SUPPORT})
-  list(APPEND clang_opt_flags -DOMPTARGET_HAS_LIBC)
-endif()
-
 # Prepend -I to each list element
 set (LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL "${LIBOMPTARGET_LLVM_INCLUDE_DIRS}")
 list(TRANSFORM LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL PREPEND "-I")

openmp/libomptarget/DeviceRTL/src/LibC.cpp

@@ -53,23 +53,10 @@ void memset(void *dst, int C, size_t count) {
     dstc[I] = C;
 }
 
-// If the user built with the GPU C library enabled we will assume that we can
-// call it.
-#ifdef OMPTARGET_HAS_LIBC
-
-// TODO: Remove this handling once we have varargs support.
-extern struct FILE *stdout;
-int32_t rpc_fprintf(FILE *, const char *, void *, uint64_t);
-
-int32_t __llvm_omp_vprintf(const char *Format, void *Arguments, uint32_t Size) {
-  return rpc_fprintf(stdout, Format, Arguments, Size);
-}
-#else
 /// printf() calls are rewritten by CGGPUBuiltin to __llvm_omp_vprintf
 int32_t __llvm_omp_vprintf(const char *Format, void *Arguments, uint32_t Size) {
   return impl::omp_vprintf(Format, Arguments, Size);
 }
-#endif
 }
 
 #pragma omp end declare target