ThToHs: fix overzealous parenthesization

Before this patch, when converting from TH.Exp to LHsExpr GhcPs,
the compiler inserted more parentheses than required:

	((f a) (b + c)) d

This was happening because the LHS of the function application was
parenthesized as if it was the RHS.

Now we use funPrec and appPrec appropriately and produce sensibly
parenthesized expressions:

	f a (b + c) d

I also took the opportunity to remove the special case for LamE,
which was not special at all and simply duplicated code.

0 files changed, 0 insertions, 0 deletions