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.
In SILGenPattern, we need to be able to unforward cleanups when we explode
tuples. Thus we can't use RValue in SILGenPattern since it may implicitly
explode tuples (which without modifying RValue itself we can not
unforward). This patch removes a specific RValue usage that we can replace with
the use of a ManagedValue instead.
rdar://49903264
