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[Driver] Create non-existent directory for -fcrash-diagnostics-dir

Authored by phosek on May 3 2019, 5:55 PM.

Description

[Driver] Create non-existent directory for -fcrash-diagnostics-dir

When user specifies non-existent directory to -fcrash-diagnostics-dir,
create it rather than failing with an error as would be the case before.

Differential Revision: https://reviews.llvm.org/D61542

llvm-svn: 359954