Changing pn threshold to 50% instruction coverage.

Former-commit-id: 1e1d867c32d4bbf56946e8a2adba7f69fe9eeabc

tools/do_p1transform.sh

@@ -21,7 +21,7 @@ EXECUTED_ADDRESSES_FINAL=final.coverage.txt
 LIBC_FILTER=$PEASOUP_HOME/tools/libc_functions.txt
 BLACK_LIST=$P1_DIR/p1.filtered_out                                            # list of functions to blacklist
 COVERAGE_FILE=$P1_DIR/p1.coverage
-P1THRESHOLD=0.30
+P1THRESHOLD=0.50
 
 PN_BINARY=$SECURITY_TRANSFORMS_HOME/tools/transforms/p1transform.exe