Meaning a method on an object, which returns a reference to self.
I am doing this because it was pointed out to me that MemoryRegionInfo
has lots of construction paramaters, and most of the time, we want the
default value for most of the things.
So now we can do:
MemoryRegionInfo(...); // Shadow stack is "don't know".
MemoryRegionInfo(...).SetIsShadowStack(eNo) // Shadow stack is "no".
Which removes one parameter from every use of the constructor.
Along the way I realised that the shadow stack "ss" flag is only tested
by the Guarded Control Stack tests, which only run on specific Arm
hardware. I've added a new "ss" test to LinuxProcMapsTest, which will
run on any system.
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