CodeGenObjC/instr-profile.m: Add -target darwin to appease bots.

This expected;
  ; Function Attrs: uwtable
  define internal void @"\01+[A foreach:]"(i8* %self, i8* %_cmd, %0* %array) #0 {

But the Name is mangled on other hosts; (x86_64-unknown-unknown)
  ; Function Attrs: nounwind uwtable
  define internal void @_c_A__foreach_(i8* %self, i8* %_cmd, %1* %array) #0 {

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203092 91177308-0d34-0410-b5e6-96231b3b80d8