[errorprone] SimilarityRenameDetector: suppress IntLongMath

Indexes are positiv.

See https://errorprone.info/bugpattern/IntLongMath

Change-Id: I9ef90b3667f833e2d708ff608929990e0a09036c

org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java

@@ -407,6 +407,7 @@ static long encode(int score, int srcIdx, int dstIdx) {
 				| encodeFile(dstIdx);
 	}
 
+	@SuppressWarnings("IntLongMath")
 	private static long encodeFile(int idx) {
 		// We invert the index so that the first file in the list sorts
 		// later in the table. This permits us to break ties favoring
@@ -415,6 +416,7 @@ private static long encodeFile(int idx) {
 		return INDEX_MASK - idx;
 	}
 
+	@SuppressWarnings("IntLongMath")
 	private static int decodeFile(int v) {
 		return INDEX_MASK - v;
 	}