instprof tests down in ARM build

A few weeks ago, I started seeing 6 tests start failing in the Profile
test suite of the ARM Linux build. Anyone else seeing this? They all
fail with similar output:

Command Output (stderr):

Looks like a silly unnamed metadata stuff. You could add a variable to
cope with the different numbers. Something like

// CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}, !prof ![[meta:.*]]
// CHECK: ![[meta]] = metadata !{metadata !"branch_weights", i32 1, i32 2}

cheers,
--renato

Can you file a PR and CC me?