Port of RTEMS to the Texas Instruments C3x/C4x DSP families including

a BSP (c4xsim) supporting the simulator included with gdb.  This port
was done by Joel Sherrill and Jennifer Averett of OAR Corporation.
Also included with this port is a space/time optimization to eliminate
FP context switch management on CPUs without hardware or software FP.

An issue with this port was that sizeof(unsigned32) = sizeof(unsigned8)
on this CPU.  This required addressing alignment checks and assumptions
as well as fixing code that assumed sizeof(unsigned32) == 4.

testsuites/sptests/spsize/size.c

@@ -356,7 +356,9 @@ uninitialized =
                 (sizeof _Thread_Ready_chain)              +
                 (sizeof _Thread_Executing)                +
                 (sizeof _Thread_Heir)                     +
+#if (CPU_HARDWARE_FP == 1) || (CPU_SOFTWARE_FP == 1)
                 (sizeof _Thread_Allocated_fp)             +
+#endif
                 (sizeof _Thread_Internal_information)     +
                 (sizeof _Thread_Idle)                     +