Update prebuilt Clang to r365631c1 from Android.

The version we had was segfaulting.

Bug: 132420445
Change-Id: Icb45a6fe0b4e2166f7895e669df1157cec9fb4e0
diff --git a/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake b/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
index 7cbd286..d0be0e8 100644
--- a/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
+++ b/linux-x64/clang/lib64/cmake/llvm/LLVMProcessSources.cmake
@@ -30,7 +30,15 @@
 
 function(add_header_files_for_glob hdrs_out glob)
   file(GLOB hds ${glob})
-  set(${hdrs_out} ${hds} PARENT_SCOPE)
+  set(filtered)
+  foreach(file ${hds})
+    # Explicit existence check is necessary to filter dangling symlinks
+    # out.  See https://bugs.gentoo.org/674662.
+    if(EXISTS ${file})
+      list(APPEND filtered ${file})
+    endif()
+  endforeach()
+  set(${hdrs_out} ${filtered} PARENT_SCOPE)
 endfunction(add_header_files_for_glob)
 
 function(find_all_header_files hdrs_out additional_headerdirs)