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!

llvm-svn: 240137
diff --git a/llvm/lib/Target/X86/X86MCInstLower.cpp b/llvm/lib/Target/X86/X86MCInstLower.cpp
index 655e06a..64135e0 100644
--- a/llvm/lib/Target/X86/X86MCInstLower.cpp
+++ b/llvm/lib/Target/X86/X86MCInstLower.cpp
@@ -112,7 +112,7 @@
     OutStreamer->EmitInstruction(Inst, getSubtargetInfo());
     SMShadowTracker.count(Inst, getSubtargetInfo());
   }
-} // end llvm namespace
+} // namespace llvm
 
 X86MCInstLower::X86MCInstLower(const MachineFunction &mf,
                                X86AsmPrinter &asmprinter)