Stop using PackedString in template-haskell; drop packedstring as a bootlib

The packedstring library has been superseded by the bytestring and text libraries, yet we are still shipping it with GHC for only one reason: it is used in the representations of three types in template-haskell.

The proposal is that we

• make the types ModName, PkgName, and OccName from Language.Haskell.TH.Syntax into abstract newtypes (an API change)
• change their representation from PackedString to String
• drop the packedstring library from the bootlibs that GHC ships with

Relevant discussions:

• http://www.haskell.org/pipermail/libraries/2008-November/010960.html

Trac metadata

Trac field	Value
Version	6.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	None
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