[PATCH] [AArch64] Enable partial unrolling and runtime unrolling for AArch64 target

[Eric Christopher]

Sure. Seems reasonable.

One comment I noticed below.

================
Comment at: lib/Target/AArch64/AArch64TargetTransformInfo.cpp:554
@@ +553,3 @@
+                                         UnrollingPreferences &UP) const {
+  //Disable partial & runtime unrolling on -Os.
+  UP.PartialOptSizeThreshold = 0;
----------------
Space here :)

http://reviews.llvm.org/D5148