6939019: Source code adjustments for parfait compilation of hotspot

Summary: Minor source code adjustments for parfait compilation, since it uses different compiler vs. JDK
Reviewed-by: never, kamg

src/os/solaris/vm/osThread_solaris.hpp

@@ -123,7 +123,7 @@
 
   int set_interrupt_callback    (Sync_Interrupt_Callback * cb);
   void remove_interrupt_callback(Sync_Interrupt_Callback * cb);
-  void OSThread::do_interrupt_callbacks_at_interrupt(InterruptArguments *args);
+  void do_interrupt_callbacks_at_interrupt(InterruptArguments *args);
 
  // ***************************************************************
  // java.lang.Thread.interrupt state.

src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp

@@ -861,7 +861,7 @@ cmpxchg_func_t*      os::atomic_cmpxchg_func      = os::atomic_cmpxchg_bootstrap
 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
 add_func_t*          os::atomic_add_func          = os::atomic_add_bootstrap;
 
-extern "C" _solaris_raw_setup_fpu(address ptr);
+extern "C" void _solaris_raw_setup_fpu(address ptr);
 void os::setup_fpu() {
   address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
   _solaris_raw_setup_fpu(fpu_cntrl);