[ORC] Add dereference operator to SymbolStringPtr.

Dereference yields a StringRef.

llvm-svn: 321836

llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h

@@ -92,6 +92,8 @@ public:
     return S->getValue() < Other.S->getValue();
   }
 
+  StringRef operator*() const { return S->first(); }
+
 private:
 
   SymbolStringPtr(SymbolStringPool::PoolMapEntry *S)

llvm/unittests/ExecutionEngine/Orc/SymbolStringPoolTest.cpp

@@ -34,6 +34,12 @@ TEST(SymbolStringPool, UniquingAndComparisons) {
   (void)(P1 < P3);
 }
 
+TEST(SymbolStringPool, Dereference) {
+  SymbolStringPool SP;
+  auto Foo = SP.intern("foo");
+  EXPECT_EQ(*Foo, "foo") << "Equality on dereferenced string failed";
+}
+
 TEST(SymbolStringPool, ClearDeadEntries) {
   SymbolStringPool SP;
   {