AMDGPU/R600: Minor cleanup in InstrInfo

Use std::make_pair instead of constructor
Use C++11 loop
Reuse helper var

Reviewers: tstellardAMD

Subsribers: arsenm

Differential Revision: http://reviews.llvm.org/D19787

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268503 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed