[PATCH] -Walloca-larger-than with constant sizes at -O0 (PR 100425)

[Martin Sebor]

Even when explicitly enabled, -Walloca-larger-than doesn't run
unless optimization is enabled as well.  This prevents diagnosing
alloca calls with constant arguments in excess of the limit that
could otherwise be flagged even at -O0, making the warning less
consistent and less useful than is possible.

The attached patch enables -Walloca-larger-than for calls with
constant arguments in excess of the limit even at -O0 (variable
arguments are only handled with optimization, when VRP runs).

Martin
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