Add subgroupBroadcast to intrinsics.def

Bug: tint:2041
Change-Id: I19d153bc67ab2851ee28247f3cf80f8253bb062f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/151580
Reviewed-by: Ben Clayton <bclayton@google.com>
Auto-Submit: David Neto <dneto@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
Commit-Queue: David Neto <dneto@google.com>
diff --git a/src/tint/lang/core/parameter_usage.h b/src/tint/lang/core/parameter_usage.h
index 39e0207..fdf355c 100644
--- a/src/tint/lang/core/parameter_usage.h
+++ b/src/tint/lang/core/parameter_usage.h
@@ -45,6 +45,7 @@
     kOffset,
     kSampleIndex,
     kSampler,
+    kSourceLaneIndex,
     kTexture,
     kValue,
     kW,