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[FileCheck] Implement --ignore-case option.

Description

[FileCheck] Implement --ignore-case option.

The FileCheck utility is enhanced to support a --ignore-case
option. This is useful in cases where the output of Unix tools
differs in case (e.g. case not specified by Posix).

Reviewers: Bigcheese, jakehehrlich, rupprecht, espindola, alexshap, jhenderson, MaskRay

Differential Revision: https://reviews.llvm.org/D68146

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