Revert "[OPENMP] Initial support for '#pragma omp for'."

This reverts commit r211096. Looks like it broke the msvc build:

SemaOpenMP.cpp(140) : error C4519: default template arguments are only allowed on a class template

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211113 91177308-0d34-0410-b5e6-96231b3b80d8