Remove custom bf16 lowering from the X86ISelLoweringCall

Author: mikolaj-pirog

llvm/lib/Target/X86/X86ISelLoweringCall.cpp

@@ -123,15 +123,6 @@ MVT X86TargetLowering::getRegisterTypeForCallingConv(LLVMContext &Context,
       !Subtarget.hasX87())
     return MVT::i32;
 
-  if (isTypeLegal(MVT::f16)) {
-    if (VT.isVector() && VT.getVectorElementType() == MVT::bf16)
-      return getRegisterTypeForCallingConv(
-          Context, CC, VT.changeVectorElementType(MVT::f16));
-
-    if (VT == MVT::bf16)
-      return MVT::f16;
-  }
-
   return TargetLowering::getRegisterTypeForCallingConv(Context, CC, VT);
 }