Bug 1316850 - make sure we don't fall through into endFunction. r=bbouvier

--HG--
extra : rebase_source : 79b84aae64e7a58a6b79d82d424ad21645f6307e
extra : histedit_source : 2aef3ae9bf85f5c4761fb440e1bba1afdb3c287a%2Cef6d9d8ec0593d8b29f471d37fbd0f4da3ba5250

js/src/wasm/WasmBaselineCompile.cpp

@@ -2051,6 +2051,9 @@ class BaseCompiler
     }
 
     bool endFunction() {
+        // Always branch to outOfLinePrologue_ or returnLabel_.
+        masm.breakpoint();
+
         // Out-of-line prologue.  Assumes that the in-line prologue has
         // been executed and that a frame of size = localSize_ + sizeof(Frame)
         // has been allocated.