[ASan] Recognize WASI as a platform with 64-bit off_t

https://github.com/WebAssembly/wasi-libc/blob/wasi-sdk-25/libc-bottom-half/headers/public/__typedef_off_t.h

Author: kateinoigakukun

compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h

@@ -190,7 +190,8 @@ typedef int pid_t;
 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_APPLE ||             \
     (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
     (SANITIZER_LINUX && !SANITIZER_GLIBC && !SANITIZER_ANDROID) ||        \
-    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__)))
+    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__))) || \
+    SANITIZER_WASI
 typedef u64 OFF_T;
 #else
 typedef uptr OFF_T;