Zalathar d4f1f92426 coverage: Restrict ExpressionUsed simplification to Code mappings
In the future, branch and MC/DC mappings might have expressions that don't
correspond to any single point in the control-flow graph. That makes it
trickier to keep track of which expressions should expect an `ExpressionUsed`
node.

We therefore sidestep that complexity by only performing `ExpressionUsed`
simplification for expressions associated directly with ordinary `Code`
mappings.
2024-07-15 20:54:28 +10:00
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