JitArm64: Set FPCR.AH

Only tested on a CPU which does not support FEAT_AFP.

Source/Core/Common/CPUDetect.h

@@ -64,6 +64,7 @@ struct CPUInfo
   bool bCRC32 = false;
   bool bSHA1 = false;
   bool bSHA2 = false;
+  bool bAFP = false;  // Alternate floating-point behavior
 
   // Call Detect()
   explicit CPUInfo();