[llvm] [memprof] Use "using namespace ::llvm::memprof;" in a unit test (PR #119144)

[Snehasish Kumar via llvm-commits]

================
@@ -30,29 +30,14 @@ using ::llvm::DILineInfo;
 using ::llvm::DILineInfoSpecifier;
 using ::llvm::DILocal;
 using ::llvm::StringRef;
-using ::llvm::memprof::CallStackId;
-using ::llvm::memprof::CallStackMap;
-using ::llvm::memprof::Frame;
-using ::llvm::memprof::FrameId;
-using ::llvm::memprof::hashCallStack;
-using ::llvm::memprof::IndexedAllocationInfo;
-using ::llvm::memprof::IndexedMemProfData;
-using ::llvm::memprof::IndexedMemProfRecord;
-using ::llvm::memprof::MemInfoBlock;
-using ::llvm::memprof::MemProfReader;
-using ::llvm::memprof::MemProfRecord;
-using ::llvm::memprof::MemProfSchema;
-using ::llvm::memprof::Meta;
-using ::llvm::memprof::PortableMemInfoBlock;
-using ::llvm::memprof::RawMemProfReader;
-using ::llvm::memprof::SegmentEntry;
 using ::llvm::object::SectionedAddress;
 using ::llvm::symbolize::SymbolizableModule;
 using ::testing::ElementsAre;
 using ::testing::Pair;
 using ::testing::Return;
 using ::testing::SizeIs;
 using ::testing::UnorderedElementsAre;
+using namespace ::llvm::memprof;
----------------
snehasish wrote:

Prefer adding a namespace to this test (and an inner anonymous one):
```
namespace llvm {
namespace memprof {
namespace {
...
```
Pros and cons discussed in this thread: https://groups.google.com/a/chromium.org/g/chromium-dev/c/pKY2G4GHcu0?e=48417069

Though it isn't required by the LLVM style guide so up to you if you want to keep as is.

https://github.com/llvm/llvm-project/pull/119144