tree cdbe7de556be0148a5236cf819ce645b187be0de
parent ae7df9e8c6a2bb715448cba488012dfb5eacf022
author dan sinclair <dsinclair@chromium.org> 1683042449 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1683042449 +0000

[ir] Emit `var` and `let` into the IR

This CL adds a nodes for `var` variables. In order to support
global var a new module level block is added, the `root_block`. It only
exists if there are declarations which are emitted into it. The
initializer for the `var` is assigned through a `store` instruction.

A `let` declaration is just the initializer result.

Bug: tint:1897
Change-Id: Icb949699ef643988151cc52026f9ad6a12cdd93f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/130761
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>