diff --git a/llvm/include/llvm/Analysis/MemoryProfileInfo.h b/llvm/include/llvm/Analysis/MemoryProfileInfo.h
--- a/llvm/include/llvm/Analysis/MemoryProfileInfo.h
+++ b/llvm/include/llvm/Analysis/MemoryProfileInfo.h
@@ -37,6 +37,9 @@
 /// Returns the allocation type from an MIB metadata node.
 AllocationType getMIBAllocType(const MDNode *MIB);
 
+/// True if the AllocTypes bitmask contains just a single type.
+bool hasSingleAllocType(uint8_t AllocTypes);
+
 /// Class to build a trie of call stack contexts for a particular profiled
 /// allocation call, along with their associated allocation types.
 /// The allocation will be at the root of the trie, which is then used to
diff --git a/llvm/lib/Analysis/MemoryProfileInfo.cpp b/llvm/lib/Analysis/MemoryProfileInfo.cpp
--- a/llvm/lib/Analysis/MemoryProfileInfo.cpp
+++ b/llvm/lib/Analysis/MemoryProfileInfo.cpp
@@ -91,7 +91,7 @@
   CI->addFnAttr(A);
 }
 
-static bool hasSingleAllocType(uint8_t AllocTypes) {
+bool llvm::memprof::hasSingleAllocType(uint8_t AllocTypes) {
   const unsigned NumAllocTypes = llvm::popcount(AllocTypes);
   assert(NumAllocTypes != 0);
   return NumAllocTypes == 1;
diff --git a/llvm/unittests/Analysis/MemoryProfileInfoTest.cpp b/llvm/unittests/Analysis/MemoryProfileInfoTest.cpp
--- a/llvm/unittests/Analysis/MemoryProfileInfoTest.cpp
+++ b/llvm/unittests/Analysis/MemoryProfileInfoTest.cpp
@@ -86,6 +86,15 @@
       AllocationType::NotCold);
 }
 
+// Test the hasSingleAllocType helper.
+TEST_F(MemoryProfileInfoTest, SingleAllocType) {
+  uint8_t NotCold = (uint8_t)AllocationType::NotCold;
+  uint8_t Cold = (uint8_t)AllocationType::Cold;
+  EXPECT_TRUE(hasSingleAllocType(NotCold));
+  EXPECT_TRUE(hasSingleAllocType(Cold));
+  EXPECT_FALSE(hasSingleAllocType(NotCold | Cold));
+}
+
 // Test buildCallstackMetadata helper.
 TEST_F(MemoryProfileInfoTest, BuildCallStackMD) {
   LLVMContext C;