Msvc has difficulties deducing the template argument here. The error message is:
basic-parsers.h(790,12): error C2672: 'applyFunction': no matching overloaded function found
Explicitly pass the first template argument to help it.
This patch is part of the series to make flang compilable with MS Visual Studio http://lists.llvm.org/pipermail/flang-dev/2020-July/000448.html.