remove fixme

Signed-off-by: Justin Stitt <[email protected]>

Author: JustinStitt

clang/lib/Sema/SemaExpr.cpp

@@ -20544,10 +20544,6 @@ void Sema::MarkDeclarationsReferencedInExpr(Expr *E,
 }
 
 /// Emit a diagnostic when statements are reachable.
-/// FIXME: check for reachability even in expressions for which we don't build a
-///        CFG (eg, in the initializer of a global or in a constant expression).
-///        For example,
-///        namespace { auto *p = new double[3][false ? (1, 2) : 3]; }
 bool Sema::DiagIfReachable(SourceLocation Loc, ArrayRef<const Stmt *> Stmts,
                            const PartialDiagnostic &PD) {
   // The initializer of a constexpr variable or of the first declaration of a