blockfreq: Remove unnecessary template parameters

Moves redundant template parameters into an implementation detail of
BlockFrequencyInfoImpl.

No functionality change.

<rdar://problem/14292693>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206084 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed