Removes Unshareable tag from PrecomputedValue (it causes invalidations).

Makes BUILD_CONFIGURATION public.

PiperOrigin-RevId: 216855028
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/SkyFunctions.java b/src/main/java/com/google/devtools/build/lib/skyframe/SkyFunctions.java
index c21ce5c..703dc7b 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/SkyFunctions.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/SkyFunctions.java
@@ -104,7 +104,7 @@
   static final SkyFunctionName TEST_COMPLETION =
       SkyFunctionName.create(
           "TEST_COMPLETION", ShareabilityOfValue.NEVER, FunctionHermeticity.HERMETIC);
-  static final SkyFunctionName BUILD_CONFIGURATION =
+  public static final SkyFunctionName BUILD_CONFIGURATION =
       SkyFunctionName.createHermetic("BUILD_CONFIGURATION");
   public static final SkyFunctionName CONFIGURATION_FRAGMENT =
       SkyFunctionName.createHermetic("CONFIGURATION_FRAGMENT");