ppc64 debug build fails

In file included from src/third_party/mozjs-38/extract/js/src/jit/shared/CodeGenerator-shared.cpp:7:0,

                 from src/third_party/mozjs-38/platform/ppc64/linux/build/Unified_cpp_js_src6.cpp:56:

src/third_party/mozjs-38/extract/js/src/jit/shared/CodeGenerator-shared-inl.h: In member function 'void js::jit::CodeGeneratorShared::verifyHeapAccessDisa                                                                                ssembly(uint32_t, uint32_t, bool, js::Scalar::Type, const js::jit::Operand&, js::jit::LAllocation)':

src/third_party/mozjs-38/extract/js/src/jit/shared/CodeGenerator-shared-inl.h:232:10: error: 'class js::jit::MacroAssembler' has no member named 'verifyHe                                                                                apAccessDisassembly'

     masm.verifyHeapAccessDisassembly(begin, end,