[Clang][LoongArch] Do not pass vector arguments via vector registers (#74990)

psABI v2.30 clarifies that vector arguments are passed according to the
base ABI by default.

Author: yjijd

clang/lib/CodeGen/Targets/LoongArch.cpp

@@ -324,13 +324,6 @@ ABIArgInfo LoongArchABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
     return ABIArgInfo::getDirect();
   }
 
-  // Pass 128-bit/256-bit vector values via vector registers directly.
-  if (Ty->isVectorType() && (((getContext().getTypeSize(Ty) == 128) &&
-                              (getTarget().hasFeature("lsx"))) ||
-                             ((getContext().getTypeSize(Ty) == 256) &&
-                              getTarget().hasFeature("lasx"))))
-    return ABIArgInfo::getDirect();
-
   // Complex types for the *f or *d ABI must be passed directly rather than
   // using CoerceAndExpand.
   if (IsFixed && Ty->isComplexType() && FRLen && FARsLeft >= 2) {