C++: accept consistency test output

Author: rdmarsh2

cpp/ql/test/library-tests/ir/ssa/aliased_ssa_sanity_unsound.expected

@@ -1,6 +1,7 @@
 missingOperand
 unexpectedOperand
 duplicateOperand
+| ssa.cpp:286:27:286:30 | ReturnIndirection: argv | Instruction has 2 operands with tag 'SideEffect' in function '$@'. | ssa.cpp:286:5:286:8 | IR: main | int main(int, char**) |
 missingPhiOperand
 missingOperandType
 duplicateChiOperand
@@ -19,6 +20,7 @@ switchInstructionWithoutDefaultEdge
 notMarkedAsConflated
 wronglyMarkedAsConflated
 invalidOverlap
+| ssa.cpp:286:27:286:30 | SideEffect | MemoryOperand 'SideEffect' has a `getDefinitionOverlap()` of 'MayPartiallyOverlap'. | ssa.cpp:286:5:286:8 | IR: main | int main(int, char**) |
 missingCanonicalLanguageType
 multipleCanonicalLanguageTypes
 missingIRType