RFR(XXS): 8073624: Fix warning "converting to non-pointer type 'bool' from NULL" in arraycopynode.cpp

[Volker Simonis]

Hi,

can I please have a review and a sponsor for the following tiny patch
which fixes a warning introduced by "JDK-6912521 System.arraycopy
works slower than the simple loop for little lengths":

http://cr.openjdk.java.net/~simonis/webrevs/2015/8073624/
https://bugs.openjdk.java.net/browse/JDK-8073624

For the following code in arraycopynode.cpp:

bool ArrayCopyNode::finish_transform(...) {
...
    if (in(TypeFunc::Control) != ctl) {
...
      return NULL;
    }
}

older versions of GCC and maybe other compilers warn about:

/arraycopynode.cpp:458: warning: converting to non-pointer type 'bool' from NULL

The fix is trivial - just return false instead of NULL as this is
already done in several other places in the same function.

It would be nice if t his could be pushed to jdk9/hs-comp as fast as
possible such that it arrives in jdk9/hs together with 6912521.


Thank you and best regards,
Volker