Fast TLS support.

SConstruct

Index: SConstruct
diff --git a/SConstruct b/SConstruct
index b432f5e75510bce87372e06198a1eae9a5df654e..edea9bdfa4d342236a8ee5430a173918bf337184 100644
--- a/SConstruct
+++ b/SConstruct
@@ -128,6 +128,9 @@ LIBRARY_FLAGS = {
     'inspector:on': {
       'CPPDEFINES':   ['INSPECTOR'],
     },
+    'fasttls:on': {
+      'CPPDEFINES':   ['V8_FAST_TLS'],
+    },
     'liveobjectlist:on': {
       'CPPDEFINES':   ['ENABLE_DEBUGGER_SUPPORT', 'INSPECTOR',
                        'LIVE_OBJECT_LIST', 'OBJECT_PRINT'],
@@ -785,6 +788,11 @@ SIMPLE_OPTIONS = {
     'default': 'off',
     'help': 'enable the disassembler to inspect generated code'
   },
+  'fasttls': {
+    'values': ['on', 'off'],
+    'default': 'on',
+    'help': 'enable fast thread local storage support'

[antonm, 2011/03/25 16:44:44]

maybe add something like 'if supported for the given platform'

[Vitaly Repeshko, 2011/03/27 15:54:48]

Done.

+  },
   'sourcesignatures': {
     'values': ['MD5', 'timestamp'],
     'default': 'MD5',