dan sinclair 79d0f2b784 [ir] Add ir::Builtin
This CL adds an `ir::Builtin` which holds the builtin function
information and arguments for a builtin call.

Bug: tint:1718
Change-Id: If08df9f7a9f7edd2781f82d4a4955635290f3f9a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/122607
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
2023-03-13 15:42:12 +00:00
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