Add atomic load/store, fetch_add, fence, and is-lock-free lowering.

src/IceIntrinsics.cpp

Index: src/IceIntrinsics.cpp
diff --git a/src/IceIntrinsics.cpp b/src/IceIntrinsics.cpp
index dbf79cf11ee19d9e4a8821e4c53e60d4b6e26968..7391094b5eb1d7a75c8cc456de0104133d6fe3dc 100644
--- a/src/IceIntrinsics.cpp
+++ b/src/IceIntrinsics.cpp
@@ -82,7 +82,7 @@ const struct IceIntrinsicsEntry_ {
   {                                                                            \
     {                                                                          \
       { Intrinsics::AtomicStore, true }                                        \
-      , { IceType_void, Overload, IceType_i32, IceType_i32 }, 5                \
+      , { IceType_void, Overload, IceType_i32, IceType_i32 }, 4                \
     }                                                                          \
     , "nacl.atomic.store." NameSuffix                                          \
   }
@@ -199,4 +199,10 @@ Intrinsics::find(const IceString &Name) const {
   return &it->second;
 }
 
+// static

[JF, 2014/06/24 01:23:29]

// static?

[jvoung (off chromium), 2014/06/24 21:16:55]

It's chromium style to indicate a static member function. E.g., see this base/
file:

https://code.google.com/p/chromium/codesearch#chromium/src/base/files/file_pa...

but this is LLVM style -- I'll leave it out.

+bool Intrinsics::VerifyMemoryOrder(uint64_t Order) {
+  // There is only one memory ordering for atomics allowed right now.
+  return Order == Intrinsics::MemoryOrderSequentiallyConsistent;
+}
+
 } // end of namespace Ice