Jit: Move dcbx ENABLE_IF

INSTRUCTION_START is supposed to be before anything else in the
function. The difference only matters if INSTRUCTION_START gets
redefined, though.

Source/Core/Core/PowerPC/Jit64/Jit_LoadStore.cpp

@@ -234,10 +234,9 @@ void Jit64::lXXx(UGeckoInstruction inst)
 
 void Jit64::dcbx(UGeckoInstruction inst)
 {
-  FALLBACK_IF(m_accurate_cpu_cache_enabled);
-
   INSTRUCTION_START
   JITDISABLE(bJITLoadStoreOff);
+  FALLBACK_IF(m_accurate_cpu_cache_enabled);
 
   // Check if the next instructions match a known looping pattern:
   // - dcbx rX

Source/Core/Core/PowerPC/JitArm64/JitArm64_LoadStore.cpp

@@ -757,10 +757,9 @@ void JitArm64::stmw(UGeckoInstruction inst)
 
 void JitArm64::dcbx(UGeckoInstruction inst)
 {
-  FALLBACK_IF(m_accurate_cpu_cache_enabled);
-
   INSTRUCTION_START
   JITDISABLE(bJITLoadStoreOff);
+  FALLBACK_IF(m_accurate_cpu_cache_enabled);
 
   u32 a = inst.RA, b = inst.RB;