[RISCV][NFC] Move VLDSX0Pred to RISCVInstrPredicates.td (#137938)

`VLDSX0Pred` is used for scheduling vector zero-stride load/store.

Author: wangpc-pp

llvm/lib/Target/RISCV/RISCVInstrPredicates.td

@@ -10,6 +10,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// This predicate is true when the rs2 operand of vlse or vsse is x0, false
+// otherwise.
+def VLDSX0Pred : MCSchedPredicate<CheckRegOperand<3, X0>>;
+
 // Returns true if this is the sext.w pattern, addiw rd, rs1, 0.
 def isSEXT_W
     : TIIPredicate<"isSEXT_W",

llvm/lib/Target/RISCV/RISCVScheduleV.td

@@ -9,10 +9,6 @@
 //===----------------------------------------------------------------------===//
 /// Define scheduler resources associated with def operands.
 
-// This predicate is true when the rs2 operand of vlse or vsse is x0, false
-// otherwise.
-def VLDSX0Pred : MCSchedPredicate<CheckRegOperand<3, X0>>;
-
 defvar SchedMxList = ["MF8", "MF4", "MF2", "M1", "M2", "M4", "M8"];
 // Used for widening and narrowing instructions as it doesn't contain M8.
 defvar SchedMxListW = !listremove(SchedMxList, ["M8"]);