[PATCH] Teach tablegen to elide case-less switch statements

[Aaron Ballman]

The following patch teaches llvm-tblgen to not emit a switch statement
when there are no case statements .  This should slightly clean up the
output from tablegen in those cases (and there are a handful).

Most of the changes in the patch are indentation levels after wrapping
code in an if block.  However, I did switch to using a stringstream in
AsmMatcherEmitter.cpp because of the complexity involved in checking
whether cases were produced or not.

~Aaron
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