min16float is not required to convert its input to an 16-bit float.
Instead, use f32tof16, and f16tof32.
This is also required to be able to enable the IEEE strictness option on
FXC, otherwise FXC emits an error X4028: expression has a minimum
precision type and cannot be marked precise
Bug: tint:1887
Change-Id: I2268c9336b8e873b36e6532984838054fe4dedbd
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/125920
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>