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[lldb] Don't emit a warning when using Objective-C getters in expressions

Authored by teemperor on Feb 11 2021, 7:17 AM.

Description

[lldb] Don't emit a warning when using Objective-C getters in expressions

Clang emits a warning when accessing an Objective-C getter but not using the result.
This gets triggered when just trying to print a getter value in the expression parser (where
Clang just sees a normal expression like obj.getter while parsing).

This patch just disables the warning in the expression parser (similar to what we do with
the C++ equivalent of just accessing a member variable but not doing anything with it).

Reviewed By: kastiglione

Differential Revision: https://reviews.llvm.org/D94307

Details