Bug 1592974 - Spill registers before emitting an interrupt check r=lth

Differential Revision: https://phabricator.services.mozilla.com/D51270

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

js/src/wasm/WasmBaselineCompile.cpp

@@ -8587,6 +8587,8 @@ bool BaseCompiler::emitLoop() {
     topBlockResults(params);
     masm.nopAlign(CodeAlignment);
     masm.bind(&controlItem(0).label);
+    // The interrupt check barfs if there are live registers.
+    sync();
     if (!addInterruptCheck()) {
       return false;
     }