VMPI_alloca_gc    102 MMgc/GC.h      #  define VMPI_alloca_gc(gc, autoptr, nbytes)	gc->allocaPush(nbytes, autoptr)
VMPI_alloca_gc    105 MMgc/GC.h      #  define VMPI_alloca_gc(gc, autoptr, nbytes)  (nbytes > AVMPLUS_PARAM_ALLOCA_CUTOFF ? gc->allocaPush(nbytes, autoptr) : alloca(nbytes))