misc: Remove redundant compiler-specific defines

This patch moves away from using M5_ATTR_OVERRIDE and the m5::hashmap
(and similar) abstractions, as these are no longer needed with gcc 4.7
and clang 3.1 as minimum compiler versions.

sim: Refactor the serialization base class

Objects that are can be serialized are supposed to inherit from the
Serializable class. This class is meant to provide a unified API for
such objects. However, so far it has mainly been used by SimObjects
due to some fundamental design limitations. This changeset redesigns
to the serialization interface to make it more generic and hide the
underlying checkpoint storage. Specifically:

* Add a set of APIs to serialize into a subsection of the current
object. Previously, objects that needed this functionality would
use ad-hoc solutions using nameOut() and section name
generation. In the new world, an object that implements the
interface has the methods serializeSection() and
unserializeSection() that serialize into a named /subsection/ of
the current object. Calling serialize() serializes an object into
the current section.

* Move the name() method from Serializable to SimObject as it is no
longer needed for serialization. The fully qualified section name
is generated by the main serialization code on the fly as objects
serialize sub-objects.

* Add a scoped ScopedCheckpointSection helper class. Some objects
need to serialize data structures, that are not deriving from
Serializable, into subsections. Previously, this was done using
nameOut() and manual section name generation. To simplify this,
this changeset introduces a ScopedCheckpointSection() helper
class. When this class is instantiated, it adds a new /subsection/
and subsequent serialization calls during the lifetime of this
helper class happen inside this section (or a subsection in case
of nested sections).

* The serialize() call is now const which prevents accidental state
manipulation during serialization. Objects that rely on modifying
state can use the serializeOld() call instead. The default
implementation simply calls serialize(). Note: The old-style calls
need to be explicitly called using the
serializeOld()/serializeSectionOld() style APIs. These are used by
default when serializing SimObjects.

* Both the input and output checkpoints now use their own named
types. This hides underlying checkpoint implementation from
objects that need checkpointing and makes it easier to change the
underlying checkpoint storage code.

mem: Page Table map api modification

This patch adds uncacheable/cacheable and read-only/read-write attributes to
the map method of PageTableBase. It also modifies the constructor of TlbEntry
structs for all architectures to consider the new attributes.

SE/FS: Get rid of includes of config/full_system.hh.

sycalls: implement mremap() and add DATA flag for getrlimit(). mremap has been tested on Alpha, compiles for the rest but not tested. I don't see why it wouldn't work though.

gcc: Add extra parens to quell warnings.
Even though we're not incorrect about operator precedence, let's add
some parens in some particularly confusing places to placate GCC 4.3
so that we don't have to turn the warning off. Agreed that this is a
bit of a pain for those users who get the order of operations correct,
but it is likely to prevent bugs in certain cases.

style: Make a style pass over the whole arch/alpha directory.

alpha: Clean up namespace usage.

style: Remove non-leading tabs everywhere they shouldn't be. Developers should configure their editors to not insert tabs

TLB: Fix serialization issues with the tlb entries and make the page table store the process, not the system.

Alpha: Fixes to get alpha to compile again.

Address translation: Make the page table more flexible.
The page table now stores actual page table entries. It is still a templated
class here, but this will be corrected in the near future.

pagetable.hh:
small fix so ALPHA_FS will build on macs
interrupts.hh:
small fix for alpha compile

src/arch/alpha/interrupts.hh:
small fix for alpha compile
src/arch/alpha/pagetable.hh:
small fix so ALPHA_FS will build on macs

Certain header files should only be used in FS.

src/arch/alpha/faults.hh:
Only use pagetable.hh in FS
src/arch/alpha/pagetable.hh:
pagetable.hh should only be included in FS, so protecting it internally should be unnecessary.
src/cpu/exetrace.cc:
Only use tlb.hh in FS

Fixed ALPHA_FS by moving the remnants of isa_fullsys_traits.hh into arch/alpha/pagetable.hh and fixing up some includes