wasm: add flag to dump modules

src/base/platform/platform-posix.cc

Index: src/base/platform/platform-posix.cc
diff --git a/src/base/platform/platform-posix.cc b/src/base/platform/platform-posix.cc
index 7e985e3fb70bc68bcc3c16789db9179dac7d298c..bb340ab5f95af47f8c455e91ceeb1c182c8d7434 100644
--- a/src/base/platform/platform-posix.cc
+++ b/src/base/platform/platform-posix.cc
@@ -429,9 +429,10 @@ bool OS::Remove(const char* path) {
   return (remove(path) == 0);
 }
 
+char OS::DirectorySeparator() { return '/'; }
 
 bool OS::isDirectorySeparator(const char ch) {
-  return ch == '/';
+  return ch == DirectorySeparator();
 }