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IRWitnessTable values (#1387)
* Generate IRType for interfaces, and use them as the type of IRWitnessTable values.
This results the following IR for the included test case:
```
[export("_S3tu010IInterface7Computep1pii")]
let %1 : _ = key
[export("_ST3tu010IInterface")]
[nameHint("IInterface")]
interface %IInterface : _(%1);
[export("_S3tu04Impl7Computep1pii")]
[nameHint("Impl.Compute")]
func %Implx5FCompute : Func(Int, Int)
{
block %2(
[nameHint("inVal")]
param %inVal : Int):
let %3 : Int = mul(%inVal, %inVal)
return_val(%3)
}
[export("_SW3tu04Impl3tu010IInterface")]
witness_table %4 : %IInterface
{
witness_table_entry(%1,%Implx5FCompute)
}
```
* Fixes per code review comments.
Moved interface type reference in IRWitnessTable from their type to operand[0].
* Fix typo in comment.
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