[TableGen] Add support of Intrinsics with multiple returns

This change deals with intrinsics with multiple outputs, for example load
instrinsic with address updated.

DAG selection for Instrinsics could be done either through source code or
tablegen. Handling all intrinsics in source code would introduce a huge chunk
of repetitive code if we have a large number of intrinsic that return multiple
values (see NVPTX as an example). While intrinsic class in tablegen supports
multiple outputs, tablegen only supports Intrinsics with zero or one output on
TreePattern. This appears to be a simple bug in tablegen that is fixed by this
change.

For Intrinsics defined as:

  def int_xxx_load_addr_updated: Intrinsic<[llvm_i32_ty, llvm_ptr_ty], [llvm_ptr_ty, llvm_i32_ty], []>;

Instruction will be defined as:

  def L32_X: Inst<(outs reg:$d1, reg:$d2), (ins reg:$s1, reg:$s2), "ld32_x $d1, $d2, $s2", [(set i32:$d1, i32:$d2, (int_xxx_load_addr_updated i32:$s1, i32:$s2))]>;

Patch by Wenbo Sun, thanks!

Differential Revision: https://reviews.llvm.org/D32888

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321704 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CodeGenDAGPatterns.cpp

@@ -2656,6 +2656,10 @@ TreePatternNode *TreePattern::ParseTreePattern(Init *TheInit, StringRef OpName){
   for (unsigned i = 0, e = Dag->getNumArgs(); i != e; ++i)
     Children.push_back(ParseTreePattern(Dag->getArg(i), Dag->getArgNameStr(i)));
 
+  // Get the actual number of results before Operator is converted to an intrinsic
+  // node (which is hard-coded to have either zero or one result).
+  unsigned NumResults = GetNumNodeResults(Operator, CDP);
+
   // If the operator is an intrinsic, then this is just syntactic sugar for for
   // (intrinsic_* <number>, ..children..).  Pick the right intrinsic node, and
   // convert the intrinsic name to a number.
@@ -2698,7 +2702,6 @@ TreePatternNode *TreePattern::ParseTreePattern(Init *TheInit, StringRef OpName){
     }
   }
 
-  unsigned NumResults = GetNumNodeResults(Operator, CDP);
   TreePatternNode *Result = new TreePatternNode(Operator, Children, NumResults);
   Result->setName(OpName);