Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
  -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
  llvm/lib/


Thanks to Eugene Kosov for the original patch!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240137 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/ErrorHandling.h

@@ -84,7 +84,7 @@ namespace llvm {
   LLVM_ATTRIBUTE_NORETURN void
   llvm_unreachable_internal(const char *msg=nullptr, const char *file=nullptr,
                             unsigned line=0);
-}
+} // namespace llvm
 
 /// Marks that the current location is not supposed to be reachable.
 /// In !NDEBUG builds, prints the message and location info to stderr.