Enables V8 integration with the Intel VTune performance analysis tool. This allows the VTune profi…

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 12182)
+++ build/common.gypi	(working copy)
@@ -73,6 +73,8 @@
 
     'v8_enable_gdbjit%': 0,
 
+    'v8_enable_vtunejit%': 0,
+
     # Enable profiling support. Only required on Windows.
     'v8_enable_prof%': 0,
 
@@ -86,6 +88,7 @@
     'v8_use_snapshot%': 'true',
     'host_os%': '<(OS)',
     'v8_use_liveobjectlist%': 'false',
+    #'werror%': '',
     'werror%': '-Werror',
 
     # With post mortem support enabled, metadata is embedded into libv8 that
@@ -117,6 +120,15 @@
       ['v8_interpreted_regexp==1', {
         'defines': ['V8_INTERPRETED_REGEXP',],
       }],
+      ['v8_enable_vtunejit==1', {
+        'conditions': [
+          ['v8_target_arch=="ia32" or v8_target_arch=="x64"', {
+            'defines': ['ENABLE_VTUNE_JIT_INTERFACE',],
+            'libraries': ['-ldl',],
+#dw -ljitprofiling',],
+          }],
+         ],
+      }],
       ['v8_target_arch=="arm"', {
         'defines': [
           'V8_TARGET_ARCH_ARM',