[X86] Remove the XFAILed test added in r348620

It seems to be unexpectedly passing on some bots probably because it requires asserts to fail, but doesn't say that. But we already have a patch in review to make it not xfail so I'd rather just focus on getting it passing rather than trying to figure out an unexpected pass.

llvm-svn: 348661

llvm/test/CodeGen/X86/test_x86condbr_globaladdr.mir

@@ -1,30 +0,0 @@
-# XFAIL: *
-# RUN: llc -o - %s -mtriple=i686-- -mcpu=ivybridge --run-pass X86CondBrFolding | FileCheck %s
-# Test wrong assertion when meet SUB32ri with global address
-# in X86CondBrFoldingiPass
---- |
-  @img2buf_normal = external global i32
-  define void @func() { ret void }
-...
----
-# CHECK: bb.0:
-# CHECK: %2:gr32 = SUB32ri %1, @img2buf_normal, implicit-def $eflags
-
-name: func
-tracksRegLiveness: true
-body: |
-  bb.0:
-    liveins: $edx
-    %1:gr32 = COPY $edx
-    %2:gr32 = MOV32rm %1:gr32, 1, $noreg, 850256, $noreg
-    %3:gr32 = SUB32ri %2:gr32, @img2buf_normal, implicit-def $eflags
-    JE_1 %bb.2, implicit $eflags
-    JMP_1 %bb.3
-
-  bb.2:
-    RET 0, undef $eax
-
-  bb.3:
-    $eax = MOV32rr %3:gr32
-    RET 0, $eax
-...