Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/tools/gen-postmortem-metadata.py b/tools/gen-postmortem-metadata.py
index 516f8e7..d808a2f 100644
--- a/tools/gen-postmortem-metadata.py
+++ b/tools/gen-postmortem-metadata.py
@@ -82,7 +82,7 @@
     { 'name': 'OddballTrue',            'value': 'Oddball::kTrue' },
     { 'name': 'OddballTheHole',         'value': 'Oddball::kTheHole' },
     { 'name': 'OddballNull',            'value': 'Oddball::kNull' },
-    { 'name': 'OddballArgumentMarker',  'value': 'Oddball::kArgumentMarker' },
+    { 'name': 'OddballArgumentsMarker', 'value': 'Oddball::kArgumentsMarker' },
     { 'name': 'OddballUndefined',       'value': 'Oddball::kUndefined' },
     { 'name': 'OddballUninitialized',   'value': 'Oddball::kUninitialized' },
     { 'name': 'OddballOther',           'value': 'Oddball::kOther' },
@@ -92,6 +92,8 @@
         'value': 'DescriptorArray::kFirstIndex' },
     { 'name': 'prop_type_field',
         'value': 'DATA' },
+    { 'name': 'prop_type_const_field',
+        'value': 'DATA_CONSTANT' },
     { 'name': 'prop_type_mask',
         'value': 'PropertyDetails::TypeField::kMask' },
     { 'name': 'prop_index_mask',