folly/Foreach.h: avoid shadowing warnings
Summary: Fix warnings exposed by gcc's -Wshadow-compatible-local. Don't use a hard-coded names that would cause shadowing with each nested use of this macro. This avoids errors like the following: folly/Foreach.h:94:18: error: declaration of 'FOR_EACH_privateCount' shadows a previous local [-Werror=shadow-compatible-local] folly/Foreach.h:91:12: error: shadowed declaration is here [-Werror=shadow-compatible-local] Reviewed By: yfeldblum Differential Revision: D4656783 fbshipit-source-id: d7cd820fb04ccd78242f7487e2b219dc300709b6
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