Ensure 16-byte stack alignment on Solaris.

GCC generates instructions such as movdqa that requires 16-byte alignment.

R=ricow@chromium.org
BUG=v8:1505
TEST=

Review URL: http://codereview.chromium.org/7277031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8432 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

ChangeLog

@@ -13,10 +13,10 @@
         Lowered limit on code space for systems with low memory supply.
 
         Allowed compiling v8_shell with the 'host' toolset (issue 82437).
-        
+
         Extended setBreakpoint API to accept partial script name (issue 1418).
 
-        Made multi-line comments not count when deciding whether the '-->' 
+        Made multi-line comments not count when deciding whether the '-->'
         comment starter is first on a line. This matches Safari.
 
         Made handling of non-array recievers in Array length setter correct

src/platform-solaris.cc

-// Copyright 2006-2009 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -105,7 +105,8 @@ uint64_t OS::CpuFeaturesImpliedByPlatform() {
 
 
 int OS::ActivationFrameAlignment() {
-  return STACK_ALIGN;
+  // GCC generates code that requires 16 byte alignment such as movdqa.
+  return Max(STACK_ALIGN, 16);
 }