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add worst-case frame size cap

The largest frame is currently in choose_partitioning:
warning: stack frame size of 44156 bytes in function 'choose_partitioning'

but adding HBD amplifies other things:
warning: stack frame size of 51480 bytes in function 'dec_build_inter_predictors'

Add some padding for sanitizer and variances between compilers.

BUG=webm:1498

Change-Id: I0d94d4f94d25dafafca9d7484881c2ce5f8de371

--- a/configure

+++ b/configure

@@ -606,8 +606,10 @@

         # https://bugs.chromium.org/p/webm/issues/detail?id=1069

         check_add_cflags -Wextra

         # check_add_cflags also adds to cxxflags. gtest does not do well with

-        # -Wundef so add it explicitly to CFLAGS only.

+        # these flags so add them explicitly to CFLAGS only.

         check_cflags -Wundef && add_cflags_only -Wundef

+        check_cflags -Wframe-larger-than=52000 && \

+          add_cflags_only -Wframe-larger-than=52000

         if enabled mips || [ -z "${INLINE}" ]; then

           enabled extra_warnings || check_add_cflags -Wno-unused-function

         fi