Doxygenize the documentation comments

There were many // comment used to document classes, functions etc. but
those are not picked up by doxygen which expects /// comments. This
converts many comments from // to /// in order to improve the generated
documentation.

BUG=
R=jvoung@chromium.org, kschimpf@google.com

Review URL: https://codereview.chromium.org/1216963007.
diff --git a/src/IceAssemblerARM32.h b/src/IceAssemblerARM32.h
index f67b630..977b43d 100644
--- a/src/IceAssemblerARM32.h
+++ b/src/IceAssemblerARM32.h
@@ -14,9 +14,10 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file implements the Assembler class for ARM32.
-//
+///
+/// \file
+/// This file implements the Assembler class for ARM32.
+///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEASSEMBLERARM32_H