for consistency

-the Makefile has been moved up from src/Makefile to the top level
-all pyston binaries and unittests (gc, analysis) are also placed in the
top directory

This time for the llvm configuration.

Sometimes when updating the LLVM directory, we need to reconfigure things.
We don't know that until after we update it, though, but Make will decide
at the beginning whether it needs to be updated or not.  We could always
reconfigure every time we update LLVM (might be ok), or add a helper
target that recursively calls Make after the updating is done (what this
patch does).

This should fix those "C compiler can't generate executables" errors that
come from running two copies of the configure script in parallel.

Ie if you override sys.stdout, prints without an explicit destination
will go to the new location.

Also sneak in a couple other bugfixes.

List right multiplication, tuple multiplication

Implement FloorDivInt

In preparation for using bitmaps for other purposes in the heap.

Fix uninitiated read of >> 3 == 3 (REPL)

Not sure how hard a requirement it is to match CPython's behavior,
but just assert out for now rather than doing something different.

Also add an assert to copySlice, which could have similar issues.

Fix slicing issues

Fix assert in very verbose mode

Set pypa option for not handling future import errors

Astprint improvements

fix memory leak

In addition:
 * unify slicing
 * performance improvements, especially for string slicing

[use_latest_valgrind] Use valgrind-3.10.0

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

Signed-off-by: Vinzenz Feenstra <evilissimo@gmail.com>

We were scanning the wrong number of bytes for conservative objects;
we were using the allocated size instead of the user size, but
starting the scan at the beginning of the user section.

Finally ran into a case where a conservative object was the very
last object in the heap and it segfaulted.