gdb: fix recent build breakage on 32 bit systems

The recent commit 3919cf8a704138e4f2dd79c66e33a62087180f1f caused a
build breakage on the 32-bit debian try bot. This seems related to how
the patch allocates space for the frame unwinder table in a gdbarch.
This commit changes that allocation to be in-place.
1 file changed