Rename AtomicExpandLoadLinked into AtomicExpand

AtomicExpandLoadLinked is currently rather ARM-specific. This patch is the first of
a group that aim at making it more target-independent. See
http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075873.html
for details

The command line option is "atomic-expand"

llvm-svn: 216231
diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index 9a0c9a4..abcf691 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -345,7 +345,7 @@
   // For codegen passes, only passes that do IR to IR transformation are
   // supported.
   initializeCodeGenPreparePass(Registry);
-  initializeAtomicExpandLoadLinkedPass(Registry);
+  initializeAtomicExpandPass(Registry);
 
 #ifdef LINK_POLLY_INTO_TOOLS
   polly::initializePollyPasses(Registry);