On `pritomrajkhowa/LoopBound`:
```
Definitions.ql-3:SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentUseUse#ff ................. 4m35s
```
specifically
```
(376s) Tuple counts for SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentUseUse#ff/2@be04e9kp after 4m58s:
388843 ~0% {4} r1 = JOIN Essa::TPhiFunction#fff_2#join_rhs WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::definesAt#ffff ON FIRST 1 OUTPUT Rhs.1, Lhs.0, Rhs.2, Rhs.3
3629812090 ~1% {7} r2 = JOIN r1 WITH SsaCompute::SsaComputeImpl::variableUse#ffff ON FIRST 1 OUTPUT Lhs.0, Rhs.2, Rhs.3, Lhs.2, Lhs.3, Lhs.1, Rhs.1 'use1'
0 ~0% {2} r3 = JOIN r2 WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentVarRefs#fffff ON FIRST 5 OUTPUT Lhs.5, Lhs.6 'use1'
0 ~0% {2} r4 = JOIN r3 WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::firstUse#ff ON FIRST 1 OUTPUT Lhs.1 'use1', Rhs.1 'use2'
897141 ~0% {2} r5 = SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentUseUseSameVar#ff UNION r4
return r5
```
Clearly we do not want to join on the variable so soon. So we unbind it
and get
```
(78s) Tuple counts for SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentUseUse#ff/2@40e0e6uv after 434ms:
3377959 ~2% {4} r1 = SCAN SsaCompute::SsaComputeImpl::variableUse#ffff OUTPUT In.0, In.2, In.3, In.1 'use1'
1026855 ~2% {4} r2 = JOIN r1 WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentVarRefs#fffff ON FIRST 3 OUTPUT Lhs.0, Rhs.3, Rhs.4, Lhs.3 'use1'
129484 ~0% {2} r3 = JOIN r2 WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::definesAt#ffff_1230#join_rhs ON FIRST 3 OUTPUT Rhs.3, Lhs.3 'use1'
0 ~0% {2} r4 = JOIN r3 WITH Essa::TPhiFunction#fff_2#join_rhs ON FIRST 1 OUTPUT Lhs.0, Lhs.1 'use1'
0 ~0% {2} r5 = JOIN r4 WITH SsaCompute::SsaComputeImpl::AdjacentUsesImpl::firstUse#ff ON FIRST 1 OUTPUT Lhs.1 'use1', Rhs.1 'use2'
897141 ~0% {2} r6 = SsaCompute::SsaComputeImpl::AdjacentUsesImpl::adjacentUseUseSameVar#ff UNION r5
return r6
```
0e31439 introduces some occasional duplicate tokens due to duplicate AST
node attributes. The long-term fix is to update `CodeToFeatures.qll`,
but for the short-term, we update the concatenation to concatenate
unique (location, token) pairs.
