Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake b/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
index d0be0e8..ba8dca3 100644
--- a/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
+++ b/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
@@ -57,10 +57,12 @@
 
 
 function(llvm_process_sources OUT_VAR)
-  cmake_parse_arguments(ARG "" "" "ADDITIONAL_HEADERS;ADDITIONAL_HEADER_DIRS" ${ARGN})
+  cmake_parse_arguments(ARG "PARTIAL_SOURCES_INTENDED" "" "ADDITIONAL_HEADERS;ADDITIONAL_HEADER_DIRS" ${ARGN})
   set(sources ${ARG_UNPARSED_ARGUMENTS})
-  llvm_check_source_file_list( ${sources} )
-  
+  if (NOT ARG_PARTIAL_SOURCES_INTENDED)
+    llvm_check_source_file_list(${sources})
+  endif()
+
   # This adds .td and .h files to the Visual Studio solution:
   add_td_sources(sources)
   find_all_header_files(hdrs "${ARG_ADDITIONAL_HEADER_DIRS}")