Follow the `call` and `call_opaque` operations, as well as `apply`,
which already are marked as `CExpression` even though they have side
effects.
Even though `emitc.load` can be included inside the `emitc.expression`,
the inlining and `--form-expression` pass won't actually inline them
inside other expression due to it having a side effect, thus unless the
user manually writes the `emitc.load` inside the `emitc.expression` it
won't appear there.
--
It was brought
https://github.com/llvm/llvm-project/pull/91475#issuecomment-2302529428
and while there was some opposition due to `load` having a side effect,
`emitc` already allows all the rest operations that have it, so for
consistency reasons, enabling it doesn't really hurt from my point of
view. Especially given that `--form-expression` doesn't allow
it to really inline inside other expressions, which makes sense, since
if the users want such behavior, they should explicitly opt-in.
0ca2d4d104