Revert "[ARM] Remove XFAIL on test/CodeGen/Generic/MachineBranchProb.ll"

Summary:
This reverts commit 79c37e1.
    
    This test passes locally but fails on the community buildbot. So we will let it
    XFAIL for now.

Patched by Mandeep Singh Grang ([email protected])

Reviewers: kparzysz, weimingz

Subscribers: aemerson, rengolin, llvm-commits

Differential Revision: http://reviews.llvm.org/D14189

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251664 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Weiming Zhao

test/CodeGen/Generic/MachineBranchProb.ll

@@ -1,7 +1,8 @@
 ; RUN: llc < %s -print-machineinstrs=expand-isel-pseudos -o /dev/null 2>&1 | FileCheck %s
 
+; ARM & AArch64 run an extra SimplifyCFG which disrupts this test.
 ; Hexagon crashes (PR23377)
-; XFAIL: hexagon
+; XFAIL: arm,aarch64,hexagon
 
 ; Make sure we have the correct weight attached to each successor.
 define i32 @test2(i32 %x) nounwind uwtable readnone ssp {