added test alloc with working purecap

allocator/testallocator/build.sh

@@ -0,0 +1,7 @@
+# build glibc
+cc -g -Wall -o glibc-bench.out -march=morello -mabi=purecap -Xclang -morello-vararg=new -lpthread glibc.c
+
+# build shared object library 
+cc -O3 -g -W -Wall -shared -o ./malloc.so -mabi=purecap -Wno-unused-parameter -lpthread -fPIC alloc.c
+
+LD_PRELOAD=malloc.so ./glibc-bench.out