Ben Clayton 0bff3fb3b7 writer/wgsl: Fix printing of for-loops
Fix various issue with formatting for loop. Add tests.

Bug: tint:952
Change-Id: I704341a15f0050ebf82df219d0c7d068a3a63c26
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/58064
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
2021-07-15 22:20:29 +00:00
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