RFR: 8033215: clang: node.cpp:284 IDX_INIT macro use uninitialized field _out

[Henry Jen]

Hi,

Please review a fix to disable uninitialized warning when build with 
clang 3.4,

http://cr.openjdk.java.net/~henryjen/jdk9/8033215/webrev/

This fix only disable the warning so that we can build with clang.

Cheers,
Henry