Make the registration hash_map static. No other module needs it. Also,
document what its for a little better.
llvm-svn: 22164
diff --git a/llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp b/llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp
index 64e7477..382bbb8 100644
--- a/llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/IPO/SimplifyLibCalls.cpp
@@ -42,8 +42,12 @@
class LibCallOptimization;
class SimplifyLibCalls;
+/// This hash map is populated by the constructor for LibCallOptimization class.
+/// Therefore all subclasses are registered here at static initialization time
+/// and this list is what the SimplifyLibCalls pass uses to apply the individual
+/// optimizations to the call sites.
/// @brief The list of optimizations deriving from LibCallOptimization
-hash_map<std::string,LibCallOptimization*> optlist;
+static hash_map<std::string,LibCallOptimization*> optlist;
/// This class is the abstract base class for the set of optimizations that
/// corresponds to one library call. The SimplifyLibCalls pass will call the