MFC r230429: Add API for obtaining extended machine context states that cannot be fit into existing mcontext_t.
On i386 and amd64 do return the extended FPU states using getcontextx(3). For other architectures, getcontextx(3) returns the same information as getcontext(2).
MFC r230864: Make the sys/ucontext.h self-contained by changing the return type of __getcontextx_size(3) from size_t to int.
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