Make tiny volatile to prevent the compiler(s) from
constant folding expressions of the form "1 - tiny",
which are used to raise FE_INEXACT.
Fix the order of "const volatile" to be consistent with
the rest of msun.
Save and restore FPU state across suspend and resume.  In earlier revisions
of this patch, resumectx() called npxresume() directly, but that doesn't
work because resumectx() runs with a non-standard %cs selector.  Instead,
all of the FPU suspend/resume handling is done in C.

MFC after:	1 week
Replace cvsweb link wihg svnweb URL in bktr(4) release notes.
Set the 'inst_length' to '0' early on before any error conditions are detected
in the emulation of the task switch. If any exceptions are triggered then the
guest %rip should point to instruction that caused the task switch as opposed
to the one after it.
Use define from if_var.h to access a field inside struct if_data,
that resides in struct ifnet.

Sponsored by:	Nginx, Inc.
The "SUB" instruction used in getcc() actually does 'x -= y' so use the
proper constraint for 'x'. The "+r" constraint indicates that 'x' is an
input and output register operand.

While here generate code for different variants of getcc() using a macro
GETCC(sz) where 'sz' indicates the operand size.

Update the status bits in %rflags when emulating AND and OR opcodes.

Reviewed by:	grehan
Remove FDT option, since it is in every file, which includes this one.
Enable SCTP support. It runs perfectly fine on a Wandboard quad.

MFC after: 3 days
Ensure that ZFS ARC free memory checks include cached pages

Also restore kmem_used() check for i386 as it has KVA limits that the raw
page counts above don't consider

PR:		187594
Reviewed by:	peter
X-MFC-With: r270759
Review:	D700
Sponsored by:	Multiplay