Avoid using hookBCIToNodeIndex directly to avoid NPE

It can be null for methods with no line number tables

Author: gilles-duboscq

espresso/src/com.oracle.truffle.espresso/src/com/oracle/truffle/espresso/nodes/BytecodeNode.java

@@ -599,7 +599,7 @@ public Object resumeContinuation(VirtualFrame frame, int bci, int top) {
 
         // set up local state.
         InstrumentationSupport instrument = instrumentation;
-        int statementIndex = instrument == null ? 0 : instrument.hookBCIToNodeIndex.lookup(0, 0, bs.endBCI());
+        int statementIndex = instrument == null ? 0 : instrument.getStatementIndexAfterJump(0, 0, bs.endBCI());
         assert bs.opcode(bci) == QUICK && nodes[bs.readCPI2(bci)] instanceof InvokeContinuableNode;
 
         return executeBodyFromBCI(frame, bci, top, statementIndex, true, true);