Roll V8 back to 3.6

Roll back to V8 3.6 to fix x86 build, we don't have ucontext.h.

This reverts commits:
5d4cdbf7a67d3662fa0bee4efdb7edd8daec9b0b
c7cc028aaeedbbfa11c11d0b7b243b3d9e837ed9
592a9fc1d8ea420377a2e7efd0600e20b058be2b

Bug: 5688872
Change-Id: Ic961bb5e65b778e98bbfb71cce71d99fa949e995
diff --git a/tools/tickprocessor.js b/tools/tickprocessor.js
index 05a3369..5f57835 100644
--- a/tools/tickprocessor.js
+++ b/tools/tickprocessor.js
@@ -146,12 +146,7 @@
 
 
 function TickProcessor(
-    cppEntriesProvider,
-    separateIc,
-    callGraphSize,
-    ignoreUnknown,
-    stateFilter,
-    snapshotLogProcessor) {
+    cppEntriesProvider, separateIc, ignoreUnknown, stateFilter, snapshotLogProcessor) {
   LogReader.call(this, {
       'shared-library': { parsers: [null, parseInt, parseInt],
           processor: this.processSharedLibrary },
@@ -186,7 +181,6 @@
       'end-code-region': null });
 
   this.cppEntriesProvider_ = cppEntriesProvider;
-  this.callGraphSize_ = callGraphSize;
   this.ignoreUnknown_ = ignoreUnknown;
   this.stateFilter_ = stateFilter;
   this.snapshotLogProcessor_ = snapshotLogProcessor;
@@ -246,7 +240,6 @@
 
 TickProcessor.CALL_PROFILE_CUTOFF_PCT = 2.0;
 
-TickProcessor.CALL_GRAPH_SIZE = 5;
 
 /**
  * @override
@@ -542,7 +535,7 @@
           padLeft(rec.parentTotalPercent.toFixed(1), 5) + '%  ' +
           indentStr + rec.internalFuncName);
     // Limit backtrace depth.
-    if (indent < 2 * self.callGraphSize_) {
+    if (indent < 10) {
       self.printHeavyProfile(rec.children, indent + 2);
     }
     // Delimit top-level functions.
@@ -771,8 +764,6 @@
         'Show only ticks from OTHER VM state'],
     '-e': ['stateFilter', TickProcessor.VmStates.EXTERNAL,
         'Show only ticks from EXTERNAL VM state'],
-    '--call-graph-size': ['callGraphSize', TickProcessor.CALL_GRAPH_SIZE,
-        'Set the call graph size'],
     '--ignore-unknown': ['ignoreUnknown', true,
         'Exclude ticks of unknown code entries from processing'],
     '--separate-ic': ['separateIc', true,
@@ -801,7 +792,6 @@
   snapshotLogFileName: null,
   platform: 'unix',
   stateFilter: null,
-  callGraphSize: 5,
   ignoreUnknown: false,
   separateIc: false,
   nm: 'nm'