Added instcombine for 'MIN(MIN(A, 27), 93)' and 'MAX(MAX(A, 93), 27)'

MIN(MIN(A, 23), 97) -> MIN(A, 23)
MAX(MAX(A, 97), 23) -> MAX(A, 97)

Differential Revision: http://reviews.llvm.org/D3629



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208849 91177308-0d34-0410-b5e6-96231b3b80d8