[all-commits] [llvm/llvm-project] 42b3a5: [clang] Add missing header include

[Shoaib Meenai via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 42b3a5fb463fd616d981888abaf0f48ab0065a8d
      https://github.com/llvm/llvm-project/commit/42b3a5fb463fd616d981888abaf0f48ab0065a8d
  Author: Shoaib Meenai <smeenai at fb.com>
  Date:   2022-07-14 (Thu, 14 Jul 2022)

  Changed paths:
    M clang/lib/Driver/ToolChains/Clang.cpp

  Log Message:
  -----------
  [clang] Add missing header include

With my version of the MSVC tools (14.11.25503), this was failing to
build because of missing declarations of `std::isalnum` and
`std::isdigit`. Include `<cctype>` to get these.