[llvm] [memprof] Add IndexedMemProfReader::getMemProfCallerCalleePairs (PR #115807)

[Kazu Hirata via llvm-commits]

================
@@ -580,6 +580,68 @@ TEST_F(InstrProfTest, test_memprof_v2_partial_schema) {
   EXPECT_THAT(WantRecord, EqualsRecord(Record));
 }
 
+TEST_F(InstrProfTest, test_caller_callee_pairs) {
+  const MemInfoBlock MIB = makePartialMIB();
+
+  Writer.setMemProfVersionRequested(memprof::Version3);
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kazutakahirata wrote:

That would trigger an assert, also being added in this PR:

```
IndexedMemProfReader::getMemProfCallerCalleePairs() const {
  assert(MemProfRecordTable);
  assert(Version == memprof::Version3);
```


https://github.com/llvm/llvm-project/pull/115807