Change minimum code range size to 3MB

There will be at least 2MB of guard pages around allocatable code memory

BUG=none
R=svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/617103006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/globals.h

@@ -148,10 +148,10 @@ const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF);
 const bool kRequiresCodeRange = true;
 const size_t kMaximalCodeRangeSize = 512 * MB;
 #if V8_OS_WIN
-const size_t kMinimumCodeRangeSize = 2 * MB;
+const size_t kMinimumCodeRangeSize = 4 * MB;
 const size_t kReservedCodeRangePages = 1;
 #else
-const size_t kMinimumCodeRangeSize = 1 * MB;
+const size_t kMinimumCodeRangeSize = 3 * MB;
 const size_t kReservedCodeRangePages = 0;
 #endif
 #else
@@ -162,7 +162,7 @@ const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
 // x32 port also requires code range.
 const bool kRequiresCodeRange = true;
 const size_t kMaximalCodeRangeSize = 256 * MB;
-const size_t kMinimumCodeRangeSize = 1 * MB;
+const size_t kMinimumCodeRangeSize = 3 * MB;
 const size_t kReservedCodeRangePages = 0;
 #else
 const bool kRequiresCodeRange = false;