[PATCH] Use NOP_EXPRs in vector lowering, and cleanup code

[Paolo Bonzini]

This patch tries to use NOP_EXPRs instead of VIEW_CONVERT_EXPRs to 
convert between vector types; it also tries to put VIEW_CONVERT_EXPRs on 
the left side of the assignment rather than the right side.  This patch 
is independent of the generic vectorization stuff.

This improves the code because these NOP_EXPRs do not change the mode 
and thus can be stripped sometimes by the optimizers.  It improves the 
code generated on Alpha for vect-7.c together with my generic 
vectorization patches, for example.

It is also an occasion to clean up the code, moving the dispatcher for 
the various expand_* functions into a separate function.

Bootstrapped/regtested C/C++ on i686-pc-linux-gnu, ok for mainline? 
(Java does not test vectors).

Paolo
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