Dan Sinclair 00cf5a4894 Add test for call expression
This CL adds unit tests for the call expression. The IsValid method is
extended to verify none of the provided parameters are a nullptr.

Change-Id: I5dfd3ec1f086ef02ab965218a1d8610a1c212628
Bug: tint:11
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/16360
Reviewed-by: Sarah Mashayekhi <sarahmashay@google.com>
Commit-Queue: Sarah Mashayekhi <sarahmashay@google.com>
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