[Bug-kawa] [bugs #11801] fluid-let problems in the presence of threads

[Per Bothner]

Update of bugs #11801 (project kawa):

                  Status:                    None => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #4:

I checked in a fix.  I use a ThreadLocation object (which contains a
ThreadLocal) to map a key and the current thread to a thread-specific
Location.

This is equivalent (more or less) to looking up the key in the current
thread's environment for each access, but we cache a thread-specific Location
handle in a ThreadLocal.

This is a less efficient than the previous solution (where we cache the
thread-specific Location) in a field, but (as discussed in comment #3) that
solution is problematical when multiple threads are involved.  Some
optimizations may be possible later, if it seems worthwhile.

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