[wgsl] Launch linear_indexing language feature

Intent to ship was approved:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69c14840.050a0220.1ae4a.08b5.GAE%40google.com

Fix: 482840564
Change-Id: Ibe5140c424ef93aae5f845bb2d4de034f06c040f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/299515
Auto-Submit: Alan Baker <alanbaker@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Alan Baker <alanbaker@google.com>

src/tint/lang/wgsl/feature_status.cc

diff --git a/src/tint/lang/wgsl/feature_status.cc b/src/tint/lang/wgsl/feature_status.cc
index 2936c42..4dfd54e 100644
--- a/src/tint/lang/wgsl/feature_status.cc
+++ b/src/tint/lang/wgsl/feature_status.cc
@@ -43,7 +43,6 @@
         case LanguageFeature::kBufferView:
         case LanguageFeature::kFilteringParameters:
         case LanguageFeature::kSwizzleAssignment:
-        case LanguageFeature::kLinearIndexing:
             return FeatureStatus::kUnsafeExperimental;
 
             ////////////////////////////////////////////////////////////////////
@@ -64,6 +63,7 @@
         case LanguageFeature::kSubgroupUniformity:
         case LanguageFeature::kTextureAndSamplerLet:
         case LanguageFeature::kTextureFormatsTier1:
+        case LanguageFeature::kLinearIndexing:
             return FeatureStatus::kShippedWithKillswitch;
 
             ////////////////////////////////////////////////////////////////////