[cfe-commits] PATCH: Adds -Wself-assign to Clang, but defaults it to off

[Chandler Carruth]

This adds a warning to Clang for self-assignment of the form:

int a = 42;
> a = a;


Code with this often is merely trying to mark a variable used, but there is
a more idiomatic way of doing that:

(void)a;


The warning is mostly a stylistic issue to help catch unintended
self-assignments which result from typos in a codebase which strictly
enforces that it shouldn't be used intentionally. As such, it is ignored by
default, but can be turned on with -Wself-assign.
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