[fir][NFC] Move fir.global printer to cpp file

All big enough parser, printer and verifier are moved to the cpp file.
This is one of the last one to be moved.

This patch is part of the upstreaming effort from fir-dev branch.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D110929

flang/include/flang/Optimizer/Dialect/FIROps.td

@@ -2666,21 +2666,7 @@ def fir_GlobalOp : fir_Op<"global", [IsolatedFromAbove, Symbol]> {
 
   let parser = "return parseGlobalOp(parser, result);";
 
-  let printer = [{
-    if (linkName().hasValue())
-      p << ' ' << linkName().getValue();
-    p << ' ';
-    p.printAttributeWithoutType((*this)->getAttr(symbolAttrName()));
-    if (auto val = getValueOrNull())
-      p << '(' << val << ')';
-    if (constantAttr())
-      p << " constant";
-    p << " : ";
-    p.printType(getType());
-    if (hasInitializationBody())
-      p.printRegion((*this)->getRegion(0), /*printEntryBlockArgs=*/false,
-                    /*printBlockTerminators=*/true);
-  }];
+  let printer = "::print(p, *this);";
 
   let skipDefaultBuilders = 1;
   let builders = [
@@ -2706,6 +2692,9 @@ def fir_GlobalOp : fir_Op<"global", [IsolatedFromAbove, Symbol]> {
 
   let extraClassDeclaration = [{
     static constexpr llvm::StringRef symbolAttrName() { return "symref"; }
+    static constexpr llvm::StringRef getConstantAttrName() {
+      return "constant";
+    }
     static constexpr llvm::StringRef linkageAttrName() { return "linkName"; }
 
     /// The printable type of the global

flang/lib/Optimizer/Dialect/FIROps.cpp

@@ -1175,6 +1175,24 @@ static ParseResult parseGlobalOp(OpAsmParser &parser, OperationState &result) {
   return mlir::success();
 }
 
+static void print(mlir::OpAsmPrinter &p, fir::GlobalOp &op) {
+  if (op.linkName().hasValue())
+    p << ' ' << op.linkName().getValue();
+  p << ' ';
+  p.printAttributeWithoutType(
+      op.getOperation()->getAttr(fir::GlobalOp::symbolAttrName()));
+  if (auto val = op.getValueOrNull())
+    p << '(' << val << ')';
+  if (op.getOperation()->getAttr(fir::GlobalOp::getConstantAttrName()))
+    p << " constant";
+  p << " : ";
+  p.printType(op.getType());
+  if (op.hasInitializationBody())
+    p.printRegion(op.getOperation()->getRegion(0),
+                  /*printEntryBlockArgs=*/false,
+                  /*printBlockTerminators=*/true);
+}
+
 void fir::GlobalOp::appendInitialValue(mlir::Operation *op) {
   getBlock().getOperations().push_back(op);
 }