Revert r361953 "[SVE][IR] Scalable Vector IR Type"

This reverts commit f4fc01f8dd.
It caused a 3-4x slowdown when doing thinlto links, PR42210.

llvm-svn: 362913

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -938,13 +938,10 @@ void ModuleBitcodeWriter::writeTypeTable() {
     }
     case Type::VectorTyID: {
       VectorType *VT = cast<VectorType>(T);
-      // VECTOR [numelts, eltty] or
-      //        [numelts, eltty, scalable]
+      // VECTOR [numelts, eltty]
       Code = bitc::TYPE_CODE_VECTOR;
       TypeVals.push_back(VT->getNumElements());
       TypeVals.push_back(VE.getTypeID(VT->getElementType()));
-      if (VT->isScalable())
-        TypeVals.push_back(VT->isScalable());
       break;
     }
     }