ohos: make configure fail if LLVM_ENABLE_PER_TARGET_RUNTIME_DIR is OFF

OHOS driver doesn't support old runtime libraries layout, so make
cmake configure report error if LLVM_ENABLE_PER_TARGET_RUNTIME_DIR
is OFF.

Author: phuang

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

@@ -510,6 +510,11 @@ function(get_compiler_rt_target arch variable)
 endfunction()
 
 function(get_compiler_rt_install_dir arch install_dir)
+  if (NOT LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+    if (LLVM_TARGET_TRIPLE MATCHES "ohos")
+      message(FATAL_ERROR "${LLVM_TARGET_TRIPLE} requires LLVM_ENABLE_PER_TARGET_RUNTIME_DIR")
+    endif()
+  endif()
   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
     get_compiler_rt_target(${arch} target)
     set(${install_dir} ${COMPILER_RT_INSTALL_LIBRARY_DIR}/${target} PARENT_SCOPE)