RFR(XS): 8205172: 32 bit build broken

[Doerr, Martin]

Hi,

32 bit build is currently broken due to:
"trap_mask": jdk/src/hotspot/share/oops/methodData.hpp(142) : warning C4293: '<<' : shift count negative or too big, undefined behavior
"PrngModMask": jdk/src/hotspot/share/runtime/threadHeapSampler.cpp(50) : warning C4293: '<<' : shift count negative or too big, undefined behavior

Please review this small fix:
http://cr.openjdk.java.net/~mdoerr/8205172_32bit_build/webrev.00/

Best regards,
Martin