Option to output precompiled instructions as a blob for use with mmap instead of assembly for use i…

runtime/bin/file.h

Index: runtime/bin/file.h
diff --git a/runtime/bin/file.h b/runtime/bin/file.h
index ae8019949eae22bce87e9a08f706716bf19f20a2..2c153bc040d1efd75885c7bf90849ebd9ee94313 100644
--- a/runtime/bin/file.h
+++ b/runtime/bin/file.h
@@ -86,6 +86,8 @@ class File : public ReferenceCounted<File> {
 
   intptr_t GetFD();
 
+  void* MapExecutable(intptr_t* num_bytes);
+
   // Read/Write attempt to transfer num_bytes to/from buffer. It returns
   // the number of bytes read/written.
   int64_t Read(void* buffer, int64_t num_bytes);