gdb

gdb
	PR python/11145:
	* python/py-value.c: Include expression.h.
	(valpy_do_cast): New function.
	(valpy_cast): Use it.
	(valpy_dynamic_cast): New function.
	(valpy_reinterpret_cast): Likewise.
	(value_object_methods): Add dynamic_cast, reinterpret_cast.
gdb/doc
	PR python/11145:
	* gdb.texinfo (Values From Inferior): Document dynamic_cast and
	reinterpret_cast methods.
gdb/testsuite
	PR python/11145:
	* gdb.python/py-value.c (Base, Derived): New types.
	(base): New global.
	* gdb.python/py-value.exp (test_subscript_regression): Add
	dynamic_cast test.