Allow Skyframe graph lookups and value retrievals to throw InterruptedException.

The only place we now don't handle InterruptedException is in the action graph created after analysis, since I'm not sure that will be around for that much longer.

--
MOS_MIGRATED_REVID=130327770
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
index 321c385..a829195 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
@@ -391,7 +391,7 @@
     return getAnalysisEnvironment().getOwner();
   }
 
-  public ImmutableList<Artifact> getBuildInfo(BuildInfoKey key) {
+  public ImmutableList<Artifact> getBuildInfo(BuildInfoKey key) throws InterruptedException {
     return getAnalysisEnvironment().getBuildInfo(this, key, getConfiguration());
   }