DSLType stored an `fPosition` which was only used in one place, when
reporting that a function is not allowed to return a particular type.
Those errors now highlight the type and function name together, which is
not really any worse than before. This allows us to shrink DSLType down
to its minimal form, just a pointer to an SkSL::Type and nothing else.
Change-Id: I4b430cb996472da0ae57bc2ab095cd123d2c3f51
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/546097
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
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