[libc] Remove 'llvm-gpu-none' directory from build (llvm#82816)

Summary:
This directory is leftover from when we handled both AMDGPU and NVPTX in
the same build and merged them into a pseudo triple. Now the only thing
it contains is the RPC server header. This gets rid of it, but now that
it's in the base install directory we should make it clear that it's an
LLVM libc header.

libc/docs/gpu/rpc.rst

@@ -104,7 +104,7 @@ Some operations are too divergent to provide generic implementations for, such
 as allocating device accessible memory. For these cases, we provide a callback 
 registration scheme to add a custom handler for any given opcode through the 
 port API. More information can be found in the installed header 
-``<install>/include/gpu-none-llvm/rpc_server.h``.
+``<install>/include/llvmlibc_rpc_server.h``.
 
 Client Example
 --------------
@@ -194,7 +194,7 @@ but the following example shows how it can be used by a standard user.
   #include <cstdlib>
   #include <cuda_runtime.h>
   
-  #include <gpu-none-llvm/rpc_server.h>
+  #include <llvmlibc_rpc_server.h>
   
   [[noreturn]] void handle_error(cudaError_t err) {
     fprintf(stderr, "CUDA error: %s\n", cudaGetErrorString(err));

libc/utils/gpu/loader/Loader.h

@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_UTILS_GPU_LOADER_LOADER_H
 #define LLVM_LIBC_UTILS_GPU_LOADER_LOADER_H
 
-#include "utils/gpu/server/rpc_server.h"
+#include "utils/gpu/server/llvmlibc_rpc_server.h"
 
 #include "include/llvm-libc-types/test_rpc_opcodes_t.h"
 

libc/utils/gpu/server/CMakeLists.txt

@@ -21,8 +21,8 @@ if(LLVM_RUNTIMES_TARGET OR LIBC_TARGET_TRIPLE)
 endif()
 
 # Install the server and associated header.
-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/rpc_server.h
-        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/gpu-none-llvm/
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/llvmlibc_rpc_server.h
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
         COMPONENT libc-headers)
 install(TARGETS llvmlibc_rpc_server
         ARCHIVE DESTINATION "lib${LLVM_LIBDIR_SUFFIX}"

libc/utils/gpu/server/rpc_server.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "rpc_server.h"
+#include "llvmlibc_rpc_server.h"
 
 #include "src/__support/RPC/rpc.h"
 #include "src/stdio/gpu/file.h"

openmp/libomptarget/plugins-nextgen/common/src/RPC.cpp

@@ -12,14 +12,8 @@
 
 #include "PluginInterface.h"
 
-// This header file may be present in-tree or from an LLVM installation. The
-// installed version lives alongside the GPU headers so we do not want to
-// include it directly.
-#if __has_include(<gpu-none-llvm/rpc_server.h>)
-#include <gpu-none-llvm/rpc_server.h>
-#elif defined(LIBOMPTARGET_RPC_SUPPORT)
-// Just pull this out of the source if available.
-#include "rpc_server.h"
+#if defined(LIBOMPTARGET_RPC_SUPPORT)
+#include "llvmlibc_rpc_server.h"
 #endif
 
 using namespace llvm;