GDBJIT: Make GDBJIT interface compile for OSX again.

src/gdb-jit.cc

Index: src/gdb-jit.cc
===================================================================
--- src/gdb-jit.cc	(revision 14512)
+++ src/gdb-jit.cc	(working copy)
@@ -500,10 +500,10 @@
 #if defined(__MACH_O)
 class MachO BASE_EMBEDDED {
  public:
-  MachO() : sections_(6) { }
+  explicit MachO(Zone * zone) : sections_(6, zone) { }
 
-  uint32_t AddSection(MachOSection* section) {
-    sections_.Add(section);
+  uint32_t AddSection(MachOSection* section, Zone* zone) {
+    sections_.Add(section, zone);
     return sections_.length() - 1;
   }
 
@@ -1919,14 +1919,15 @@
 static JITCodeEntry* CreateELFObject(CodeDescription* desc, Zone* zone) {
   ZoneScope zone_scope(zone, DELETE_ON_EXIT);
 #ifdef __MACH_O
-  MachO mach_o;
+  MachO mach_o(zone);
   Writer w(&mach_o);
 
-  mach_o.AddSection(new MachOTextSection(kCodeAlignment,
-                                         desc->CodeStart(),
-                                         desc->CodeSize()));
+  mach_o.AddSection(new(zone) MachOTextSection(kCodeAlignment,
+                                               desc->CodeStart(),
+                                               desc->CodeSize()),
+                    zone);
 
-  CreateDWARFSections(desc, &mach_o);
+  CreateDWARFSections(desc, zone, &mach_o);
 
   mach_o.Write(&w, desc->CodeStart(), desc->CodeSize());
 #else