I have a fix for this, but I'd like for someone else to look over it and
perhaps sanity check it before I commit it.  Volunteers?

This is a very old limitation.

Let's say I have three directories in my shell buffer directory stack:

	/s/software/wwwroot/Java Development Kit
	/s/software/wwwroot/Perl Compatible Regular Expressions
	~/src/build/depot/main/tools/build

If I run M-x shell-resync-dirs, I simply get the error:

	Couldn’t cd: (error No such directory found via CDPATH environment variable)

because the directory "/s/software/wwwroot/Java" doesn't exist.  The parser
considers whitespace to be a separator between directory tokens.

This version handles that case.

Diff and full function attached below.