Bug 1431787 - Mark wr_dec_ref_arc safe to be called by the WebRenderAPI destructor when WR is not built. r=lsalzman a=RyanVM

Landing on a CLOSED TREE because this needs to go to beta to fix the build.

MozReview-Commit-ID: cSwZ2Bp242

gfx/webrender_bindings/src/bindings.rs

@@ -2055,6 +2055,7 @@ pub extern "C" fn wr_add_ref_arc(arc: &ArcVecU8) -> *const VecU8 {
     Arc::into_raw(arc.clone())
 }
 
+/// cbindgen:postfix=WR_DESTRUCTOR_SAFE_FUNC
 #[no_mangle]
 pub unsafe extern "C" fn wr_dec_ref_arc(arc: *const VecU8) {
     Arc::from_raw(arc);

gfx/webrender_bindings/webrender_ffi_generated.h

@@ -1022,7 +1022,7 @@ WR_FUNC;
 
 WR_INLINE
 void wr_dec_ref_arc(const VecU8 *aArc)
-WR_FUNC;
+WR_DESTRUCTOR_SAFE_FUNC;
 
 WR_INLINE
 void wr_dp_clear_save(WrState *aState)