[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/fastcc.ll b/llvm/test/CodeGen/Mips/fastcc.ll
index bf082f6..dee4258 100644
--- a/llvm/test/CodeGen/Mips/fastcc.ll
+++ b/llvm/test/CodeGen/Mips/fastcc.ll
@@ -1,8 +1,8 @@
 ; RUN: llc < %s -march=mipsel -relocation-model=pic | FileCheck %s
-; RUN: llc < %s -mtriple=mipsel-none-nacl-gnu -relocation-model=pic \
+; RUN: llc < %s -mtriple=mipsel-none-nacl-gnu -relocation-model=pic -mips-tail-calls=1\
 ; RUN:  | FileCheck %s -check-prefix=CHECK-NACL
-; RUN: llc < %s -march=mipsel -mcpu=mips32 -mattr=+nooddspreg -relocation-model=pic | FileCheck %s -check-prefix=NOODDSPREG
-; RUN: llc < %s -march=mipsel -mcpu=mips32r2 -mattr=+fp64,+nooddspreg -relocation-model=pic | FileCheck %s -check-prefix=FP64-NOODDSPREG
+; RUN: llc < %s -march=mipsel -mcpu=mips32 -mattr=+nooddspreg -relocation-model=pic -mips-tail-calls=1| FileCheck %s -check-prefix=NOODDSPREG
+; RUN: llc < %s -march=mipsel -mcpu=mips32r2 -mattr=+fp64,+nooddspreg -relocation-model=pic -mips-tail-calls=1 | FileCheck %s -check-prefix=FP64-NOODDSPREG
 
 
 @gi0 = external global i32