--- a/js/src/assembler/assembler/AssemblerBuffer.h
+++ b/js/src/assembler/assembler/AssemblerBuffer.h
@@ -59,19 +59,16 @@ namespace JSC {
     class AssemblerBuffer {
         static const int inlineCapacity = 256;
     public:
         AssemblerBuffer()
             : m_buffer(m_inlineBuffer)
             , m_capacity(inlineCapacity)
             , m_size(0)
             , m_oom(false)
-#if defined(DEBUG) && defined(JS_GC_ZEAL) && defined(JSGC_ROOT_ANALYSIS) && !defined(JS_THREADSAFE)
-            , m_skipInline(js::TlsPerThreadData.get(), &m_inlineBuffer)
-#endif
         {
         }
 
         ~AssemblerBuffer()
         {
             if (m_buffer != m_inlineBuffer)
                 free(m_buffer);
         }
@@ -245,27 +242,16 @@ namespace JSC {
             m_capacity = newCapacity;
         }
 
         char m_inlineBuffer[inlineCapacity];
         char* m_buffer;
         int m_capacity;
         int m_size;
         bool m_oom;
-
-#if defined(DEBUG) && defined(JS_GC_ZEAL) && defined(JSGC_ROOT_ANALYSIS) && !defined(JS_THREADSAFE)
-        /*
-         * GC Pointers baked into the code can get stored on the stack here
-         * through the inline assembler buffer. We need to protect these from
-         * being poisoned by the rooting analysis, however, they do not need to
-         * actually be traced: the compiler is only allowed to bake in
-         * non-nursery-allocated pointers, such as Shapes.
-         */
-        js::SkipRoot m_skipInline;
-#endif
     };
 
     class GenericAssembler
     {
         js::Sprinter *printer;
 
       public: