Make BinaryBlobException stackless

We use BinaryBlobException to signal a binary blob was found and never
make use of its stack trace. Suppress filling in the stack trace to
avoid the performance penalty coming with that.

See https://shipilev.net/blog/2014/exceptional-performance/

Change-Id: Iae1f1c19a1fa8aef4f6569822557171130299958

org.eclipse.jgit/src/org/eclipse/jgit/errors/BinaryBlobException.java

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/errors/BinaryBlobException.java b/org.eclipse.jgit/src/org/eclipse/jgit/errors/BinaryBlobException.java
index 58a1214..768931c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/errors/BinaryBlobException.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/errors/BinaryBlobException.java
@@ -22,4 +22,9 @@ public class BinaryBlobException extends Exception {
 	 * Construct a BinaryBlobException.
 	 */
 	public BinaryBlobException() {}
+
+	@Override
+	public synchronized Throwable fillInStackTrace() {
+		return this;
+	}
 }