Store Skylark command-line flags in Skyframe

This is the first of two CLs for making command line options able to affect the Skylark interpreter. It introduces SkylarkSemanticsOptions, and stores it as a precomputed (injected) value in Skyframe. The next CL will read these options from Skyframe when constructing the Skylark environment.

This CL affects the dataflow from command/test initialization to Skyframe. Some code paths, like those used for testing, use the default SkylarkSemanticsOptions and therefore won't be able to use (for example) --incompatible_* flags. The call sites to update were found by searching for uses of defaultVisibility and working upward from there.

RELNOTES: None
PiperOrigin-RevId: 154432058
diff --git a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
index 60c5853..8e57f6c 100644
--- a/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
+++ b/src/test/java/com/google/devtools/build/lib/pkgcache/IncrementalLoadingTest.java
@@ -43,6 +43,7 @@
 import com.google.devtools.build.lib.skyframe.SkyValueDirtinessChecker;
 import com.google.devtools.build.lib.skyframe.SkyframeExecutor;
 import com.google.devtools.build.lib.syntax.GlobList;
+import com.google.devtools.build.lib.syntax.SkylarkSemanticsOptions;
 import com.google.devtools.build.lib.testutil.ManualClock;
 import com.google.devtools.build.lib.util.BlazeClock;
 import com.google.devtools.build.lib.util.Preconditions;
@@ -492,6 +493,7 @@
       skyframeExecutor.preparePackageLoading(
           new PathPackageLocator(outputBase, ImmutableList.of(workspace)),
           packageCacheOptions,
+          Options.getDefaults(SkylarkSemanticsOptions.class),
           "",
           UUID.randomUUID(),
           ImmutableMap.<String, String>of(),
@@ -579,6 +581,7 @@
       skyframeExecutor.preparePackageLoading(
           new PathPackageLocator(outputBase, ImmutableList.of(workspace)),
           packageCacheOptions,
+          Options.getDefaults(SkylarkSemanticsOptions.class),
           "",
           UUID.randomUUID(),
           ImmutableMap.<String, String>of(),