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[Driver] Make the findVCToolChainViaEnvironment case-insensitive

Authored by ArturGainullin on Apr 12 2021, 9:39 PM.

Description

[Driver] Make the findVCToolChainViaEnvironment case-insensitive

PATH usage on Windows is case-insensitive. There could be situations
when toolchain path can't be obtained from PATH because of
case-sensitivity of the findVCToolChainViaEnvironment.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D100361