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Hide runtime support values such as clang's __vla_expr from frame variable

Authored by aprantl on May 2 2019, 4:07 PM.

Description

Hide runtime support values such as clang's __vla_expr from frame variable

by respecting the "artificial" attribute on variables. Function
arguments that are artificial and useful to end-users are being
whitelisted by the language runtime.

rdar://problem/45322477

Differential Revision: https://reviews.llvm.org/D61451

llvm-svn: 359841