Correcting a use of var vs precise var type.

Author: anthonycanino

src/coreclr/jit/gentree.cpp

@@ -25754,7 +25754,7 @@ GenTree* Compiler::gtNewSimdShuffleVariableNode(
             }
 
             // the below is implemented for integral types
-            var_types origSimdBaseType = simdBaseType;            
+            var_types origSimdBaseType = simdBaseType;
 
             if (varTypeIsFloating(origSimdBaseType))
             {

src/coreclr/jit/lowerarmarch.cpp

@@ -1692,7 +1692,8 @@ GenTree* Lowering::LowerHWIntrinsic(GenTreeHWIntrinsic* node)
             if (isContainableMemory || !op2->OperIsConst())
             {
                 unsigned  simdSize     = node->GetSimdSize();
-                var_types simdBaseType = node->GetSimdBaseType();
+                // todo-xarch-simd-vartypes: `simdBaseType` was originally used as a JitType2Var type below
+                var_types simdBaseType = node->GetSimdBaseTypeAsVarType();
                 var_types simdType     = Compiler::getSIMDTypeForSize(simdSize);
 
                 // We're either already loading from memory or we need to since