Add IIT_V6 to support 6-element vectors in intrinsics. (#88196)

Needed for the future patch.

Author: rampitec

llvm/include/llvm/IR/Intrinsics.td

@@ -319,6 +319,7 @@ def IIT_FUNCREF : IIT_VT<funcref, 55>;
 def IIT_I2 : IIT_Int<2, 57>;
 def IIT_I4 : IIT_Int<4, 58>;
 def IIT_AARCH64_SVCOUNT : IIT_VT<aarch64svcount, 59>;
+def IIT_V6 : IIT_Vec<6, 60>;
 }
 
 defvar IIT_all_FixedTypes = !filter(iit, IIT_all,

llvm/lib/IR/Function.cpp

@@ -1172,6 +1172,10 @@ static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
     OutputTable.push_back(IITDescriptor::getVector(4, IsScalableVector));
     DecodeIITType(NextElt, Infos, Info, OutputTable);
     return;
+  case IIT_V6:
+    OutputTable.push_back(IITDescriptor::getVector(6, IsScalableVector));
+    DecodeIITType(NextElt, Infos, Info, OutputTable);
+    return;
   case IIT_V8:
     OutputTable.push_back(IITDescriptor::getVector(8, IsScalableVector));
     DecodeIITType(NextElt, Infos, Info, OutputTable);