Remove SF# register's aliases

Remove SF# register's aliases in order to solve a problem caused by D157864.
    llvm/llvm-project#78942

Author: kaz7

llvm/lib/Target/VE/VERegisterInfo.td

@@ -108,11 +108,8 @@ foreach I = 0-63 in
   def SW#I : VEReg<I, "sw"#I, [], ["s"#I]>, DwarfRegNum<[I]>;
 
 // Generic floating point registers - 32 bits wide
-//   NOTE: Mark SF#I as alias of SW#I temporary to avoid register allocation
-//         problem.
 foreach I = 0-63 in
-  def SF#I : VEReg<I, "sf"#I, [], ["s"#I], [!cast<VEReg>("SW"#I)]>,
-                   DwarfRegNum<[I]>;
+  def SF#I : VEReg<I, "sf"#I, [], ["s"#I]>, DwarfRegNum<[I]>;
 
 // Generic integer registers - 64 bits wide
 let SubRegIndices = [sub_i32, sub_f32], CoveredBySubRegs = 1 in {