Truffle: Improved support for "probing" AST nodes: - Node.isSafelyReplacaeableBy(Node) checks in advance if Node.replace(Node) would be unsafe (crash the VM). - Hoist Probe() from language imlementations into Node; now completely language agnostic. - Language implementations support probing by implementing Node.isInstrumentable() and Node.createWrapperNode() - Node.Probe() throws ProbeException (without side effects) if the probe fails. -- ProbeException contains an instance of ProbeFailure that diagnoses the failure in detail - Additional measures to prevent instrumentation from being applied to internal InstrumentationNodes. - Promote ProbeListener to top level interface and add a default implementation

/* 
 * This tests that simple arithmetic gets inlined.
 */
function add(a, b) { 
    return a + b;
}


function test() {
    i = 0;
    while (i < 100) {
        i = add(i, 1);
    }
    return i;
}

function main() {
    waitForOptimization(callUntilOptimized(test));
    assertTrue(isInlined(test, test, add), "add is not inlined");
}