RFC: Allow emergency EH pool size to be controlled (for stage 1)

[Jonathan Wakely]

This patch allows the size of the emergency buffer for exception
handling to be controlled by a build-time macro (to avoid dynamic
allocation) or by a run-time environment variable (to allocate a
larger or smaller buffer).

This will have to wait for the next stage 1 now, as it's too late for
GCC 7, but this shows what I'm thinking about and so might avoid
anybody else reinventing the wheel.

The patch doesn't include documentation updates for the manual, which
would be needed to explain the use of the macro and the env var. We
could also add a --with-libstdcxx-static-eh-pool=N configure flag to
make it easier to set the macro.


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