If you need to convert it yourself, I would highly recommend starting with this page of al-qadim.com, which links to two conversions of Al-Qadim to 3.0. Essentially, a holy slayer is an assassin with more options, so it shouldn't be hard to convert it to PFRPG.
Personally, I love the conversion labelled "Al-Qadim Conversion Manual, v1.00". That has not only a great Assassin class, but also great conversions for Sha'ir, Hakima, and Merchants. I was never terribly crazy about the one labelled "New Arabian Adventure, v7.1", though.
Ah, I can't stop talking about that Al-Qadim Conversion Manual. It was using that conversion to create and play a Sha'ir and a Hakima that I was truly converted heart and soul to 3rd Edition. Until then, I kept entertaining ideas about persuading my friends to go back to earlier editions of D&D, but ever since seeing that Al-Qadim conversion, I decided that 3.X can do ANYTHING worth doing in D&D. I've never gone back to AD&D since then, despite my heavy use of AD&D material.
There have also been some 3.5 conversions in Dragon magazine. They might also be useful for converting things to Pathfinder.
Issue 315 (2004 January) has the Sha'ir as a base class and gives stats for gens.
Issue 321 (2004 July) offers prestige class versions of Holy Slayers, Barbers, Mamluks, and Corsairs.
Issue 334 (2005 August) has updated stats for the following monsters: Asag, Clockwork Eunuch, Flying Monkey, Humbaba, Relief Golem, Simurgh.
Issue 340 (2006 February) has a Master Astrologer prestige class (maybe not necessarily Al'Qadim, but it certainly could fit the flavour).
Note that the Legacy of Fire adventure path (while still 3.5) presents a Paizo/Golarion version of genies. AP 21 has an article on genies in general, AP 22 has one on dealing with/binding genies (including the 5-level Genie Binder prestige class), AP 23 deals with the City of Brass, and AP 24 discusses genies and wish magic. The entire AP is pretty much soaked in genie lore and doings, and other stuff which could be used for an Al'Qadim conversion to Pathfinder.
Furthermore, the Pathfinder Companion supplement for Qadira has the Daivrat prestige class (10 levels) for "friends of genies".
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There have also been some 3.5 conversions in Dragon magazine. They might also be useful for converting things to Pathfinder.
Issue 315 (2004 January) has the Sha'ir as a base class and gives stats for gens.
Issue 321 (2004 July) offers prestige class versions of Holy Slayers, Barbers, Mamluks, and Corsairs.
Issue 334 (2005 August) has updated stats for the following monsters: Asag, Clockwork Eunuch, Flying Monkey, Humbaba, Relief Golem, Simurgh.
Issue 340 (2006 February) has a Master Astrologer prestige class (maybe not necessarily Al'Qadim, but it certainly could fit the flavour).
Note that the Legacy of Fire adventure path (while still 3.5) presents a Paizo/Golarion version of genies. AP 21 has an article on genies in general, AP 22 has one on dealing with/binding genies (including the 5-level Genie Binder prestige class), AP 23 deals with the City of Brass, and AP 24 discusses genies and wish magic. The entire AP is pretty much soaked in genie lore and doings, and other stuff which could be used for an Al'Qadim conversion to Pathfinder.
Furthermore, the Pathfinder Companion supplement for Qadira has the Daivrat prestige class (10 levels) for "friends of genies".
Thanks Bellona for the dragon magazine references.
I'm glad to have helped! :)