Bug 1491770: Add Cranelift to the list of Spidermonkey fuzzing configurations; r=lth

Differential Revision: https://phabricator.services.mozilla.com/D34150

--HG--
extra : moz-landing-system : lando

js/src/shell/fuzz-flags.txt

@@ -66,6 +66,7 @@
 --wasm-gc
 --wasm-compiler=ion
 --wasm-compiler=baseline
+--wasm-compiler=cranelift
 --test-wasm-await-tier2
 
 # CPU instruction set-related