Type annotations for instruction operands are omitted, e.g.
```
%3 = struct $S(%1, %2)
```
Operand types are redundant anyway and were only used for sanity checking in the SIL parser.
But: operand types _are_ printed if the definition of the operand value was not printed yet.
This happens:
* if the block with the definition appears after the block where the operand's instruction is located
* if a block or instruction is printed in isolation, e.g. in a debugger
The old behavior can be restored with `-Xllvm -sil-print-types`.
This option is added to many existing test files which check for operand types in their check-lines.
We cannot prove that the whole struct is overwritten between two lazy property getters.
We would need AliasAnalysis for this, but currently this is not used in CSE.
rdar://problem/67734844
If such a call is dominated by another call to the same getter, it is replaced by a direct load of the property - assuming that it is already computed.
rdar://problem/34715412
