[PATCH] Print the argument names in declarations while debugging

[Justin Bogner via llvm-commits]

When llvm declarations have argument names, it would be nice to actually
print those names when debugging. Arguably, it'd be nice to print them
all the time, but that would mean the IR we output wouldn't round trip
through bitcode, which doesn't store the names.

The attached patch makes the varous print() methods in AsmWriter
optionally print "for debug" and makes the dump() methods set that
flag. The only thing this does differently for now is print the argument
names in declarations.

Does this seem reasonable?

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