adds src/plugins/instantiate/tests

Makefile

src/plugins/instantiate/tests/plugin/needs_global.i

...plugins/instantiate/tests/stdlib/oracle/calloc.res.oracle

src/plugins/instantiate/tests/stdlib/oracle/free.res.oracle

...plugins/instantiate/tests/stdlib/oracle/malloc.res.oracle

...s/instantiate/tests/stdlib/oracle/no_fc_stdlib.res.oracle

...plugins/instantiate/tests/string/oracle/memcmp.res.oracle

...plugins/instantiate/tests/string/oracle/memcpy.res.oracle

...lugins/instantiate/tests/string/oracle/memmove.res.oracle

...ugins/instantiate/tests/string/oracle/memset_0.res.oracle

...gins/instantiate/tests/string/oracle/memset_FF.res.oracle

...iate/tests/string/oracle/memset_nested_typedef.res.oracle

...ntiate/tests/string/oracle/memset_nested_union.res.oracle

...s/instantiate/tests/string/oracle/memset_value.res.oracle