Fix PR23384 (under "-lsr-insns-cost" option)

Summary:
The patch adds instructions number generated by a solution
 to LSR cost under "-lsr-insns-cost" option.

Reviewers: qcolombet, hfinkel

Differential Revision: http://reviews.llvm.org/D28307

From: Evgeny Stupachenko <evstupac@gmail.com>
llvm-svn: 294821