Adding Vector Context xtest - #827

D/TA: TA_CreateEntryPoint:20 TA_CreateEntryPoint
D/TA: TA_OpenSessionEntryPoint:38 TA_OpenSessionEntryPoint
F/TC:? 0 trace_syscall:147 syscall #10 (syscall_unmask_cancellation)
I/TA: TA: Initialising Vector registers with test pattern...
I/TA: Dave TA: Before Context Switch
I/TA: Dave TA: GetSystemTime force a context switch...
F/TC:? 0 trace_syscall:147 syscall #13 (syscall_get_time)
I/TA: Dave TA: First Resumed. Verifying Vector register integrity...
I/TA: Dave TA: After First Context Switch
I/TA: Dave TA: Sleeping for 50ms to force a context switch...
F/TC:? 0 trace_syscall:147 syscall #13 (syscall_get_time)
I/TA: Dave TA: Second Resumed. Verifying Vector register integrity...
I/TA: Dave TA: After Second Context Switch
I/TA: Dave TA: SUCCESS! Vector context switch verified perfectly.

xtest output