[mips] Disable tail calls temporarily

Disable tail calls while the remaining bugs are fixed. Enable only for tests.

Reviewers: vkalintiris

Differential Review: https://reviews.llvm.org/D24912

llvm-svn: 282487
diff --git a/llvm/test/CodeGen/Mips/lazy-binding.ll b/llvm/test/CodeGen/Mips/lazy-binding.ll
index 2e2f350..c0007fc 100644
--- a/llvm/test/CodeGen/Mips/lazy-binding.ll
+++ b/llvm/test/CodeGen/Mips/lazy-binding.ll
@@ -1,4 +1,4 @@
-; RUN: llc -march=mipsel -relocation-model=pic < %s | FileCheck %s
+; RUN: llc -march=mipsel -relocation-model=pic -mips-tail-calls=1 < %s | FileCheck %s
 
 ; CHECK-LABEL: foo6:
 ; CHECK: %while.body