[WASM] Support integer inputs for bilinear resizing and crop and resizing.

[nsthorat]

We do this by first casting the input to float32. This happens in V8 so should be very fast.

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This change is 

[dsmilkov]

Reviewed 8 of 8 files at r1, 1 of 1 files at r2.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @annxingyuan and @dsmilkov)

[annxingyuan]

Reviewable status: complete! 2 of 1 approvals obtained (waiting on @annxingyuan, @dsmilkov, and @nsthorat)

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tfjs-backend-wasm/src/kernels/CropAndResize.ts, line 76 at r1 (raw file):

  let imagesData = backend.dataIdMap.get(images.dataId);
  let castedDataId;

Should we call this castedData instead?

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tfjs-core/src/ops/image_ops_test.ts, line 469 at r1 (raw file):

        [1, 2, 0, 3, 4, 0, 3, 4, 0, 5, 6, 6, 7, 8, 8, 0, 0, 0]);
  });
  it('int32 image returns float output', async () => {

Just curious does this test fail correctness on master?

[nsthorat]

Reviewable status: complete! 2 of 1 approvals obtained (waiting on @annxingyuan)

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tfjs-backend-wasm/src/kernels/CropAndResize.ts, line 76 at r1 (raw file):

Previously, annxingyuan (Ann Yuan) wrote…

Should we call this castedData instead?

Done. Good suggestion :)

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tfjs-core/src/ops/image_ops_test.ts, line 469 at r1 (raw file):

Previously, annxingyuan (Ann Yuan) wrote…

Just curious does this test fail correctness on master?

Yeah it does