[SH] Adjust stack area for simulator

[Oleg Endo]

Hi,

When using the default configuration, sh-sim runs effectively with
something like 3 MBytes of RAM.  This is because the stack base address
is set to 0x300000 in the default linker script.

When using sh-sim for running the GCC testsuite, the limited RAM
results in a bunch of "heap stack collision" type of errors.  The
attached patch raises the stack base address and VM memory size to
around 1 GByte.  Although that seems a lot, on modern systems it should
be fine, as not all reserved memory will be committed, if it's not
touched.  With this, running the GCC with e.g. -j12 shows no problems
and in turn quite some failures disappear.

Cheers,
Oleg


ld/ChangeLog:
	* emulparams/shelf.sh: Set stack area to 0x3FFFFF00.

sim/ChangeLog:
	* sh/interp.c (sim_memory_size): Default init to 30.
	(parse_and_set_memory_size): Adjust upper bound to 31.
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