Fix tests + make a static variable to avoid multiple instances

Author: Mariovido

dd-java-agent/agent-iast/src/main/java/com/datadog/iast/model/VulnerabilityType.java

@@ -273,6 +273,8 @@ public String getName() {
   }
 
   class Builder {
+    private static final BitSet BIT_SET = new BitSet(SourceTypes.STRINGS.length + 1);
+
     private final byte type;
     private char separator = ' ';
     private int mark = NOT_MARKED;
@@ -301,7 +303,7 @@ public Builder deduplicable(final boolean deduplicable) {
     }
 
     public Builder excludedSources(final byte... excludedSources) {
-      BitSet bitSet = new BitSet(SourceTypes.STRINGS.length + 1);
+      BitSet bitSet = BIT_SET;
       for (byte value : excludedSources) {
         bitSet.set(value);
       }

dd-java-agent/agent-iast/src/main/java/com/datadog/iast/taint/Ranges.java

@@ -438,7 +438,8 @@ public static Range[] excludeRangesBySource(Range[] ranges, BitSet source) {
     RangeBuilder newRanges = new RangeBuilder(ranges.length);
 
     for (Range range : ranges) {
-      if (!source.get(range.getSource().getOrigin())) {
+      if (range.getSource().getOrigin() == SourceTypes.NONE
+          || !source.get(range.getSource().getOrigin())) {
         newRanges.add(range);
       }
     }