This macro allows us to hide angle's usage of try/catch so that we can
properly hide them from compilers that do not support exceptions
properly (such as clang-cl and gcc/clang with -fno-exceptions).

Change-Id: I75f466a5322e5840e007711ea851f444bd6ca299
Reviewed-on: https://chromium-review.googlesource.com/206562Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: <ehsan@mozilla.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>