I have the 2006 paperback " Henri Cartier-Bresson the man the image & the world - a retrospective" pp 431. At the back is a postscript by HCB thanking those involved in its production.
It notes:" Contrary to the impression that Cartier Bresson wandered the streets of the world discovering his photographs through a serendipitious conjunction of intuition and luck, the evidence at Magnum Photos shows that he researched, planned and positioned himself to take advantage of major eventa, and then worked extremely hard to photograph them with great thoroughness"
I daresay he would have been careful in his choice of film therefore.
It is not mentioned in the book as far as I can see,