[PATCH] [CodeGen] Introduce a FAULTING_LOAD_OP pseudo-op.

[Andrew Trick]

Looks good.


================
Comment at: docs/FaultMaps.rst:20-26
@@ +19,9 @@
+
+For example, Java requires null checks on objects before they are read
+from or written to.  If the object is ``null`` then a
+``NullPointerException`` has to be thrown, interrupting normal
+execution.  In practice, however, dereferencing a ``null`` pointer is
+extremely rare in well-behaved Java programs, and typically the null
+check can be folded into a nearby memory operation that operates on
+the same memory location.
+
----------------
Should this be an admonition?

================
Comment at: docs/FaultMaps.rst:52
@@ +51,3 @@
+      uint32  : FaultingPCOffset
+      uint32  : hnlderPCOffset
+    }
----------------
"Handler"

http://reviews.llvm.org/D10197

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