[Bug 1599] New: change _Context_Switch_necessary to _Dispatch_needed

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1599

           Summary: change _Context_Switch_necessary to _Dispatch_needed
           Product: RTEMS
           Version: HEAD
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpukit
        AssignedTo: joel.sherrill at oarcorp.com
        ReportedBy: giddyup44 at yahoo.com


Created an attachment (id=843)
 --> (https://www.rtems.org/bugzilla/attachment.cgi?id=843)
changes the macro _Context_Switch_necessary to _Dispatch_needed

This PR affects all architectures, and addresses a change made as part of the
per-cpu patch to the naming of some variables.  This patch changes the macro
_Context_Switch_necessary to _Dispatch_needed, to more accurately reflect the
notion of a dispatch rather than a simple context switch.  When the
_Dispatch_needed flag is set, the Thread_Dispatch routine should eventually be
executed.

Built and tested on pc386 BSP on QEMU. hello and ticker run.

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