Tiny mmap emulation for Windows

- prerequisite of supporting YJIT with VC++.
- note that now can specfily `--yjit` on mswin64, but not enabled
  YJIT'ed code because of YJIT requires `OPT_DIRECT_THREADED_CODE`
  or `OPT_CALL_THREADED_CODE` in `rb_yjit_compile_iseq`.

1 files changed, 1 insertions, 1 deletions

diff --git a/yjit.h b/yjit.h
index 6f66f59f01..53e8b531a9 100644
--- a/yjit.h
+++ b/yjit.h
@@ -16,7 +16,7 @@
 #endif
 
 // We generate x86 assembly and rely on mmap(2).
-#if defined(__x86_64__) && !defined(_WIN32)
+#if defined(__x86_64__) || defined(_WIN64)
 # define YJIT_SUPPORTED_P 1
 #else
 # define YJIT_SUPPORTED_P 0