s/tblgen/llvm-tblgen/g in a few missed places, including the tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/TableGen/CStyleComment.td b/test/TableGen/CStyleComment.td
index cc203d0..55fb0e7 100644
--- a/test/TableGen/CStyleComment.td
+++ b/test/TableGen/CStyleComment.td
@@ -1,6 +1,6 @@
 // Test that multiline, nested, comments work correctly.
 //
-// RUN: tblgen < %s
+// RUN: llvm-tblgen < %s
 // XFAIL: vg_leak
 
 /* Foo