Reserve a page at the beginning of the code range on Win64 for SEH

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 3d8f57aadde42aa8a4eb06429b0b3911af3707f8..dc7568f3bc4249e57e9b1e8dc445a07e7f0be5b0 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -147,6 +147,13 @@ const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000);
 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 kReservedCodeRangePages = 1;
+#else
+const size_t kMinimumCodeRangeSize = 1 * MB;
+const size_t kReservedCodeRangePages = 0;
+#endif
 #else
 const int kPointerSizeLog2 = 2;
 const intptr_t kIntptrSignBit = 0x80000000;
@@ -155,9 +162,13 @@ 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 kReservedCodeRangePages = 0;
 #else
 const bool kRequiresCodeRange = false;
 const size_t kMaximalCodeRangeSize = 0 * MB;
+const size_t kMinimumCodeRangeSize = 0 * MB;
+const size_t kReservedCodeRangePages = 0;
 #endif
 #endif