RFR (XXS): 8037962: metaspaceTracer.cpp misses a symbol

[Erik Helin]

Hi all,

this small patch fixes an issue when compiling metaspaceTracer.cpp with 
OPENJDK=true and USE_PRECOMPILED_HEADER=0. The problem is that the 
symbol oopDesc::klass() is missing, this is fixed by including 
oops/oop.inline.hpp.

Thanks to Goetz Lindenmaier for finding this issue!

Webrev:
http://cr.openjdk.java.net/~ehelin/8037962/webrev.00/

Testing:
- Compiling with OPENJDK=true and USE_PRECOMPILED_HEADER=0 and then
   running java -version

Thanks,
Erik