JIT: Initial FPRF support

Doesn't support all the FPSCR flags, just the FPRF ones.
Add PPCAnalyzer support to remove unnecessary FPRF calculations.

POV-ray benchmark with enableFPRF forced on for an extreme comparison:
Before: 1500s
After, fmul/fmadd only: 728s
After, all float: 753s

In real games that use FPRF, like F-Zero GX, FPRF previously cost a few percent
of total runtime.

Since FPRF is so much faster now, if enableFPRF is set, just do it for every
float instruction, not just fmul/fmadd like before. I don't know if this will
fix any games, but there's little good reason not to.

Source/Core/Core/PowerPC/PowerPC.h

@@ -187,11 +187,15 @@ inline u64 PPCCRToInternal(u8 value)
 	return cr_val;
 }
 
+// convert flags into 64-bit CR values with a lookup table
+extern const u64 m_crTable[16];
+
 // Warning: these CR operations are fairly slow since they need to convert from
 // PowerPC format (4 bit) to our internal 64 bit format. See the definition of
 // ppcState.cr_val for more explanations.
-inline void SetCRField(int cr_field, int value) {
-	PowerPC::ppcState.cr_val[cr_field] = PPCCRToInternal(value);
+inline void SetCRField(int cr_field, int value)
+{
+	PowerPC::ppcState.cr_val[cr_field] = m_crTable[value];
 }
 
 inline u32 GetCRField(int cr_field) {