swift

f0f78a14 - [sil] Templatize base class of FieldIndexCacheBase.

[sil] Templatize base class of FieldIndexCacheBase. Previously FieldIndexCacheBase only had a parent class of SingleValueInstruction. I need to be able to in certain cases shim in a SingleValueInstruction subclass as a parent class instead. In my case it is to imbue ownership forwarding on StructExtractInst. This commit itself doesn't make that change and instead just always templatizes using SingleValueInstruction.