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There are a couple of words in The Etymologies from the 1930s that seem to indicate primitive ls could become ll in Quenya:

Although the adverbial suffixes often used a joining vowel when combined with consonantal nouns, in cases where the final consonant of the noun matched the first consonant of the suffix, the suffix was usually assimilated to the noun: Amanna “to Aman” (VT49/26), menello “from heaven (menel)” (VT43/13). In a set of Quenya prayers from the 1950s (VT43, VT44), however, Tolkien experimented with some more complex assimilations.

The locative suffix -sse indicates location at the specified place, and is variously glossed “at, in, on”. Sometimes Tolkien also used the term inessive (“in”) and adessive (“on”) to refer to this case (PE21/68); the exact meaning is contextual.

The ablative suffix -llo indicates motion away from the declined noun, and is variously glossed “(away) from, out of”. On occasion Tolkien also used the term elative (“out of”) to refer to this case (PE21/68); the exact meaning is contextual.

The allative suffix -nna indicates motion towards the declined noun, and is variously glossed “to, towards, onto, upon”. On occasion Tolkien also used the term illative (“into”) to refer to this case (PE21/68); the exact meaning is contextual.

There are three Quenya noun cases that have to do with the motion or location of the declined noun: