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Add clang-cl "vctoolsdir" option to specify the location of the msvc toolchain

Authored by zahen on Aug 26 2020, 5:58 AM.

Description

Add clang-cl "vctoolsdir" option to specify the location of the msvc toolchain

Add an option to directly specify where the msvc toolchain lives for
clang-cl and avoid unwanted file and registry probes.

Differential revision: https://reviews.llvm.org/D85998