0049adfe12
Allows to print code snippets that refer to arguments or local
variables. E.g. `emitc.verbatim "#pragma abc var={}" args %arg0 :
!emitc.ptr<i32>` is printed as `#pragma abc var=v1` when the translator
had decided to print `%arg0` as `v1`.
As a follow-up PR, we will use the same infra to extend opaque type,
which provides a way to generate template types depending on the
spelling of other types.