Move declaration of DIGlobalVariableExpressionArrayAttr in different file.

As suggested in the review comments.

Author: abidh

mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td

@@ -471,6 +471,10 @@ def LLVM_DIGlobalVariableExpressionAttr
   let constBuilderCall = "$0";
 }
 
+def DIGlobalVariableExpressionArrayAttr :
+  TypedArrayAttrBase<LLVM_DIGlobalVariableExpressionAttr,
+  "an array of variable expressions">;
+
 //===----------------------------------------------------------------------===//
 // DIGlobalVariableAttr
 //===----------------------------------------------------------------------===//

mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td

@@ -16,7 +16,6 @@
 include "mlir/Dialect/LLVMIR/LLVMAttrDefs.td"
 include "mlir/Dialect/LLVMIR/LLVMEnums.td"
 include "mlir/Dialect/LLVMIR/LLVMOpBase.td"
-include "mlir/IR/AttrTypeBase.td"
 include "mlir/IR/EnumAttr.td"
 include "mlir/Interfaces/FunctionInterfaces.td"
 include "mlir/IR/SymbolInterfaces.td"
@@ -1153,9 +1152,6 @@ def LLVM_AddressOfOp : LLVM_Op<"mlir.addressof",
   let hasFolder = 1;
 }
 
-def DIGlobalVariableExpressionArrayAttr :
-  TypedArrayAttrBase<LLVM_DIGlobalVariableExpressionAttr, "an array of variable expressions">;
-
 def LLVM_GlobalOp : LLVM_Op<"mlir.global",
     [IsolatedFromAbove, SingleBlockImplicitTerminator<"ReturnOp">, Symbol]> {
   let arguments = (ins