Used usleep(1) instead of _mm_pause on Linux and Mac OSX. This reduces the CPU usage in the video thread's idle loop. Added YieldCPU to the DSP LLE loop.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7125 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/Thread.h

@@ -142,7 +142,7 @@ void SetCurrentThreadAffinity(u32 mask);
 #ifdef _WIN32
 		YieldProcessor();
 #elif defined(_M_IX86) || defined(_M_X64)
-		_mm_pause();
+		usleep(1);
 #endif
 	}
 	

Source/Core/Core/Src/HW/DSPLLE/DSPLLE.cpp

@@ -96,7 +96,7 @@ void DSPLLE::dsp_thread(DSPLLE *lpParameter)
 			}
 			Common::AtomicStore(dsp_lle->m_cycle_count, 0);
 		}
-		// yield?
+		Common::YieldCPU();
 	}
 }