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/WATCHLISTS b/WATCHLISTS
index 81e941f..29b957b 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -43,9 +43,11 @@
       'filepath': 'src/debug/',
     },
     'interpreter': {
-      'filepath': 'src/interpreter/',
-      'filepath': 'test/cctest/interpreter/',
-      'filepath': 'test/unittests/interpreter/',
+      'filepath': 'src/interpreter/' \
+                  '|src/compiler/interpreter' \
+                  '|src/compiler/bytecode' \
+                  '|test/cctest/interpreter/' \
+                  '|test/unittests/interpreter/',
     },
     'feature_shipping_status': {
       'filepath': 'src/flag-definitions.h',
@@ -53,9 +55,12 @@
     'gc_changes': {
       'filepath': 'src/heap/',
     },
-    'merges': {
-      'filepath': '.',
+    'arm': {
+      'filepath': '/arm/',
     },
+    'ia32': {
+      'filepath': '/ia32/',
+    }
   },
 
   'WATCHLISTS': {
@@ -79,9 +84,12 @@
       'hpayer@chromium.org',
       'ulan@chromium.org',
     ],
-    'merges': [
-      # Only enabled on branches created with tools/release/create_release.py
-      'v8-merges@googlegroups.com',
+    'arm': [
+      'v8-mips-ports@googlegroups.com',
+      'v8-ppc-ports@googlegroups.com',
+    ],
+    'ia32': [
+      'v8-x87-ports@googlegroups.com',
     ],
   },
 }