Add binop-select test to profcheck-xfail.txt (llvm#166678)

Revealed in PR llvm#166102, which itself doesn't _cause_ the profile being
dropped. Referencing if it makes debugging easier.

Author: mtrofin

llvm/utils/profcheck-xfail.txt

@@ -358,6 +358,7 @@ Transforms/InstCombine/apint-div2.ll
 Transforms/InstCombine/ashr-demand.ll
 Transforms/InstCombine/atomic.ll
 Transforms/InstCombine/binop-cast.ll
+Transforms/InstCombine/binop-select.ll
 Transforms/InstCombine/binop-select-cast-of-select-cond.ll
 Transforms/InstCombine/bit-checks.ll
 Transforms/InstCombine/bitreverse.ll