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/Transforms/InstCombine/InstCombinePHI.cpp b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
index 6a6693c..a93ffbe 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombinePHI.cpp
@@ -582,7 +582,7 @@
   LoweredPHIRecord(PHINode *pn, unsigned Sh)
     : PN(pn), Shift(Sh), Width(0) {}
 };
-}
+} // namespace
 
 namespace llvm {
   template<>
@@ -603,7 +603,7 @@
              LHS.Width == RHS.Width;
     }
   };
-}
+} // namespace llvm
 
 
 /// SliceUpIllegalIntegerPHI - This is an integer PHI and we know that it has an