Copying CBMC proofs from aws/amazon-freertos repo ./tools/cbmc to this repo ./FreeRTOS/Test/CBMC as is.

The commit ID in aws/amazon-freertos is 0c8e0217f2a43bdeb364b58ae01c6c259e03ef1b.

FreeRTOS/Test/CBMC/cmake/compute-coverage.cmake

@@ -0,0 +1,14 @@
+execute_process(
+    COMMAND
+        cbmc --cover location --xml-ui
+        ${cbmc_flags} ${cbmc_verbosity} ${goto_binary}
+    OUTPUT_FILE ${out_file}
+    ERROR_FILE ${out_file}
+    RESULT_VARIABLE res
+)
+
+if(NOT (${res} EQUAL 0 OR ${res} EQUAL 10))
+    message(FATAL_ERROR
+        "Unexpected CBMC coverage return code '${res}' for proof ${proof_name}. Log written to ${out_file}."
+    )
+endif()