Bug 1101001.  Stop checking compileAndGo in GetPCCountScriptContents.  r=bhackett
Bug 1100579 part 1.  Remove the overloads of JS::Evaluate that don't take an rval mutable handle, and control the behavior via the JS::CompileOptions instead.  r=waldo,bholley
Bug 1100579 part 2.  Kill off JS_Evaluate(UC)Script.  r=waldo