Fix a compile-time regression introduced by my heuristic-changing patch. I forgot

Fix a compile-time regression introduced by my heuristic-changing patch.  I forgot
to multiply the instruction count by a constant factor in a few places, which
caused the register allocator to require many more iterations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53959 91177308-0d34-0410-b5e6-96231b3b80d8