[PATCH] Fix error in tablegen when second operand of an !if is an empty list.

[Matt Arsenault]

  Add test. I didn't know there were any tests for tablegen before.

http://llvm-reviews.chandlerc.com/D2724

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2724?vs=6946&id=7192#toc

Files:
  lib/TableGen/TGParser.cpp
  test/TableGen/if-empty-list-arg.td

Index: lib/TableGen/TGParser.cpp
===================================================================
--- lib/TableGen/TGParser.cpp
+++ lib/TableGen/TGParser.cpp
@@ -1028,7 +1028,13 @@
     }
     Lex.Lex();  // eat the ','
 
-    Init *RHS = ParseValue(CurRec);
+    // Get the type in case the second operand might be an empty list. We can
+    // infer the next item's type is the same.
+    RecTy *MHSTy = 0;
+    if (TypedInit *MHSt = dyn_cast<TypedInit>(MHS))
+      MHSTy = MHSt->getType();
+
+    Init *RHS = ParseValue(CurRec, MHSTy);
     if (RHS == 0) return 0;
 
     if (Lex.getCode() != tgtok::r_paren) {
Index: test/TableGen/if-empty-list-arg.td
===================================================================
--- /dev/null
+++ test/TableGen/if-empty-list-arg.td
@@ -0,0 +1,6 @@
+// RUN: llvm-tblgen %s
+// XFAIL: vg_leak
+
+class C<bit cond> {
+  list<int> X = !if(cond, [1, 2, 3], []);
+}
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