Revert "Make compiler/optimizing/ symbols hidden."

This reverts commit e2727154f25e0db9a5bb92af494d8e47b181dfcf.

Reason for revert: Breaks ASAN tests (ODR violation).
Bug: 142365358

Change-Id: I38103d74a1297256c81d90872b6902ff1e9ef7a4
diff --git a/compiler/optimizing/load_store_analysis.h b/compiler/optimizing/load_store_analysis.h
index 8d01cbb..08d9309 100644
--- a/compiler/optimizing/load_store_analysis.h
+++ b/compiler/optimizing/load_store_analysis.h
@@ -17,12 +17,11 @@
 #ifndef ART_COMPILER_OPTIMIZING_LOAD_STORE_ANALYSIS_H_
 #define ART_COMPILER_OPTIMIZING_LOAD_STORE_ANALYSIS_H_
 
-#include "base/macros.h"
 #include "escape.h"
 #include "nodes.h"
 #include "optimization.h"
 
-namespace art HIDDEN {
+namespace art {
 
 // A ReferenceInfo contains additional info about a reference such as
 // whether it's a singleton, returned, etc.