RFR: 8191562: Missing include in gcArguments.cpp breaks minimal JVM build

[Roman Kennke]

David Holmes reported build failures in minimal JVM due to missing 
include in gcArguments.cpp:

https://bugs.openjdk.java.net/browse/JDK-8191562

This should fix it:

http://cr.openjdk.java.net/~rkennke/8191562/webrev.00/ 
<http://cr.openjdk.java.net/%7Erkennke/8191562/webrev.00/>

Unfortunately, the minimal JVM doesn't build at all for me (*), so I am 
posting this blindly. However, it seems fairly obvious that it's 
correct: UNSUPPORTED_OPTION is defined in arguments.hpp, including it 
should fix the build failure.

Ok to go?

Roman

(*)

/home/rkennke/src/openjdk/jdk-hs/src/hotspot/cpu/x86/c1_Runtime1_x86.cpp: 
In member function 'int StubAssembler::call_RT(Register, Register, 
address, int)':
/home/rkennke/src/openjdk/jdk-hs/src/hotspot/cpu/x86/c1_Runtime1_x86.cpp:136:10: 
error: 'call_offset' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
    return call_offset;
           ^
cc1plus: all warnings being treated as errors