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6f42153eac
Empty StmtSequences appear, for example, in the `else` branch of `if`
statements like the following:
foo
if cond
bar
else
end
baz
Before this change, the CFG for this code would look like this:
foo
│
│
▼
cond
│
true │
▼
bar
│
│
▼
if
│
│
▼
baz
i.e. there is linear flow through the condition, the `then` branch, and
out of the if. This doesn't account for the possibility that the
condition is false and `bar` is not executed. After this change, the CFG
looks like this:
foo
│
│
▼
cond
│ │
true │ │ false
▼ │
bar │
│ │
│ │
▼ ▼
if
│
│
▼
baz
i.e. we correctly account for the `false` condition.