[thinlto] Deleted unused test file

Summary:
This file should be referenced from
thinlto-function-summary-callgraph-pgo.ll file,
but someone forgot to use it there. Everything worked because
we store pgo data about callsite blocks, so there is no need to have
pgo count of @func.

Reviewers: tejohnson, eraman, mehdi_amini

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D24309

llvm-svn: 280882