[X86] Move X86ISD::FP_TO_SINT_SAT/FP_TO_UINT_SAT outside of the MEMORY_OPCODE enum block (#140272)

Move to closer to the other regular conversion opcodes

Fixes #140271

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.h

@@ -724,6 +724,10 @@ namespace llvm {
     MCVTSI2P,
     MCVTUI2P,
 
+    // Custom handling for FP_TO_xINT_SAT
+    FP_TO_SINT_SAT,
+    FP_TO_UINT_SAT,
+
     // Vector float to bfloat16.
     // Convert packed single data to packed BF16 data
     CVTNEPS2BF16,
@@ -917,10 +921,6 @@ namespace llvm {
     // Load x87 FPU environment from memory.
     FLDENVm,
 
-    // Custom handling for FP_TO_xINT_SAT
-    FP_TO_SINT_SAT,
-    FP_TO_UINT_SAT,
-
     /// This instruction implements FP_TO_SINT with the
     /// integer destination in memory and a FP reg source.  This corresponds
     /// to the X86::FIST*m instructions and the rounding mode change stuff. It