first pass at minimal invokedynamic support for Java 8 lambdas

This is a bunch of commits squashed into one per Josh's request.

add dynamicTable field

add invokedynamic instruction

add defaultDynamic bootimage field

add dummy invokedynamic support in bootimage-generator

add defaultDynamic thunk

check dynamicTable offset

comment defaultDynamicThunk to fix unused function

comment defaultDynamicThunk to fix unused function

add dynamicTable / dynamicIndex stuff

comment dynamicIndex and dynamicTable

add invokedynamic instruction impl

stub out addDynamic

unstub addDynamic

don't allow tail calls in invokedynamic

implement stub JVM_GetTemporaryDirectory method

(build broken) begin add InvokeDynamicTest

Revert "(build broken) begin add InvokeDynamicTest"

This reverts commit 77f9c54e32ac66d0803eeab93e4a10d3541987a8.

add InternalError

add URLClassPath.c for openjdk-src builds

implement stub JVM_KnownToNotExist and JVM_GetResourceLookupCache methods

intercept open0 / open for openjdk

add basic java/lang/invoke stubs

remove non-public java/lang/invoke classes

fix invokedynamic example building

<wip debugging>

classpath/java/lang/invoke/MethodHandle.java

@@ -0,0 +1,3 @@
+package java.lang.invoke;
+public abstract class MethodHandle {
+}