Ben Clayton 3cbb136b8a Re-allow dynamic indexing of 'let' arrays and matrices
Spec change: https://github.com/gpuweb/gpuweb/pull/2427
Reverses: tint:867

This reverts and fixes commits:
 b6fdcc54df6e012578e69550788e2b4b2b611c32
 10442eff7db4271d53eed553795e655068488276

Added a bunch of end-to-end tests.

Fixed: tint:1352
Change-Id: I34968243bbec1cab838c8ba50a6f027146bbfd06
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/75401
Reviewed-by: David Neto <dneto@google.com>
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
2022-01-06 18:11:01 +00:00
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