LowerBitSets: Move declarations to separate namespace.

Should fix modules build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265176 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/IPO/LowerBitSets.h

@@ -31,6 +31,8 @@ class GlobalObject;
 class Value;
 class raw_ostream;
 
+namespace lowerbitsets {
+
 struct BitSetInfo {
   // The indices of the set bits in the bitset.
   std::set<uint64_t> Bits;
@@ -197,6 +199,7 @@ struct ByteArrayBuilder {
                 uint64_t &AllocByteOffset, uint8_t &AllocMask);
 };
 
+} // end namespace lowerbitsets
 } // end namespace llvm
 
 #endif // LLVM_TRANSFORMS_IPO_LOWERBITSETS_H

lib/Transforms/IPO/LowerBitSets.cpp

@@ -33,6 +33,7 @@
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
 
 using namespace llvm;
+using namespace lowerbitsets;
 
 #define DEBUG_TYPE "lowerbitsets"
 

unittests/Transforms/IPO/LowerBitSets.cpp

@@ -11,6 +11,7 @@
 #include "gtest/gtest.h"
 
 using namespace llvm;
+using namespace lowerbitsets;
 
 TEST(LowerBitSets, BitSetBuilder) {
   struct {