This CL updates the intrinsics lexer to allow negative values for int
and float numerics. This allows doing `@test_value(-2)` in the def file.
Change-Id: I2cad9b25a2932057ce9bc51dec6c32231e06f0a0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107440
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>