[cfe-commits] [Patch] Extend -Wliteral-conversion to warn on string literals to bool conversion

[Richard Trieu]

Add a new warning and bundle it into -Wliteral-conversion.  This
warning triggers on cases where a string literal is implicitly
converted to a bool.  For the common case of:

assert(condition && "Error text");

an exception for string literals in logical operations has also been included.
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