dan sinclair 50714622b4 Cleanup IdentifierExpression API.
This CL renames the parts of the identifier to segments and then adds a
path() and name() methods to get the respective parts of the identifier.

Change-Id: I1a365df7cb83ac0dd3d6be9ec6ccb83bfc73dd91
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/19762
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
2020-04-20 14:21:00 +00:00
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