[SystemZ]  Enable machine scheduler.

The machine scheduler (before register allocation) is enabled by default for
SystemZ.

The SelectionDAG scheduling preference now becomes source order scheduling
(was regpressure).

Review: Ulrich Weigand
https://reviews.llvm.org/D37977

llvm-svn: 315063
diff --git a/llvm/test/CodeGen/SystemZ/tls-02.ll b/llvm/test/CodeGen/SystemZ/tls-02.ll
index 15918d0..12d52a4 100644
--- a/llvm/test/CodeGen/SystemZ/tls-02.ll
+++ b/llvm/test/CodeGen/SystemZ/tls-02.ll
@@ -10,8 +10,8 @@
 ; CHECK-MAIN-LABEL: foo:
 ; CHECK-MAIN: ear [[HIGH:%r[0-5]]], %a0
 ; CHECK-MAIN: sllg %r2, [[HIGH]], 32
-; CHECK-MAIN: ear %r2, %a1
-; CHECK-MAIN: larl %r1, x@INDNTPOFF
+; CHECK-MAIN-DAG: ear %r2, %a1
+; CHECK-MAIN-DAG: larl %r1, x@INDNTPOFF
 ; CHECK-MAIN: ag %r2, 0(%r1)
 ; CHECK-MAIN: br %r14
   ret i32 *@x