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

The patch is generated using this command:

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

To reduce churn, not touching namespaces spanning less than 10 lines.

llvm-svn: 240270
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index e77c124..41a826c 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -685,7 +685,7 @@
   }
 };
 
-}
+} // namespace
 
 /// Rewrite input constraint references after adding some output constraints.
 /// In the case where there is one output and one input and we add one output,
@@ -1750,7 +1750,7 @@
 
   addStackProbeSizeTargetAttribute(D, GV, CGM);
 }
-}
+} // namespace
 
 void X86_64ABIInfo::postMerge(unsigned AggregateSize, Class &Lo,
                               Class &Hi) const {
@@ -3151,7 +3151,7 @@
   }
 };
 
-}
+} // namespace
 
 llvm::Value *PPC32_SVR4_ABIInfo::EmitVAArg(llvm::Value *VAListAddr,
                                            QualType Ty,
@@ -3431,7 +3431,7 @@
   }
 };
 
-}
+} // namespace
 
 // Return true if the ABI requires Ty to be passed sign- or zero-
 // extended to 64 bits.
@@ -3977,7 +3977,7 @@
 
   bool doesReturnSlotInterfereWithArgs() const override { return false; }
 };
-}
+} // namespace
 
 ABIArgInfo AArch64ABIInfo::classifyArgumentType(QualType Ty) const {
   Ty = useFirstFieldIfTransparentUnion(Ty);
@@ -4605,7 +4605,7 @@
   ARMTargetCodeGenInfo::setTargetAttributes(D, GV, CGM);
   addStackProbeSizeTargetAttribute(D, GV, CGM);
 }
-}
+} // namespace
 
 void ARMABIInfo::computeInfo(CGFunctionInfo &FI) const {
   if (!getCXXABI().classifyReturnType(FI))
@@ -5179,7 +5179,7 @@
   // Append metadata to nvvm.annotations
   MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
 }
-}
+} // namespace
 
 //===----------------------------------------------------------------------===//
 // SystemZ ABI Implementation
@@ -5220,7 +5220,7 @@
     : TargetCodeGenInfo(new SystemZABIInfo(CGT, HasVector)) {}
 };
 
-}
+} // namespace
 
 bool SystemZABIInfo::isPromotableIntegerType(QualType Ty) const {
   // Treat an enum type as its underlying type.
@@ -5530,7 +5530,7 @@
                            CodeGen::CodeGenModule &M) const override;
 };
 
-}
+} // namespace
 
 void MSP430TargetCodeGenInfo::setTargetAttributes(const Decl *D,
                                                   llvm::GlobalValue *GV,
@@ -5612,7 +5612,7 @@
     return SizeOfUnwindException;
   }
 };
-}
+} // namespace
 
 void MipsABIInfo::CoerceToIntArgs(
     uint64_t TySize, SmallVectorImpl<llvm::Type *> &ArgList) const {
@@ -5979,7 +5979,7 @@
   }
 }
 
-}
+} // namespace
 
 //===----------------------------------------------------------------------===//
 // Hexagon ABI Implementation
@@ -6014,7 +6014,7 @@
   }
 };
 
-}
+} // namespace
 
 void HexagonABIInfo::computeInfo(CGFunctionInfo &FI) const {
   if (!getCXXABI().classifyReturnType(FI))
@@ -6128,7 +6128,7 @@
                            CodeGen::CodeGenModule &M) const override;
 };
 
-}
+} // namespace
 
 void AMDGPUTargetCodeGenInfo::setTargetAttributes(
   const Decl *D,