[PATCH] [MC] Make bundle alignment mode setting idempotent and support nested bundles

[Eli Bendersky]

LGTM, with a couple of nits

================
Comment at: lib/MC/MCAssembler.cpp:338
@@ +337,3 @@
+    }
+    if(--BundleLockNestingDepth == 0) {
+      BundleLockState = NotBundleLocked;
----------------
if (

================
Comment at: lib/MC/MCAssembler.cpp:346
@@ +345,3 @@
+  // group is align_to_end. So don't downgrade from align_to_end to just locked.
+  if (BundleLockState != BundleLockedAlignToEnd)
+    BundleLockState = NewState;
----------------
Can you put {...} around the contents, for consistency with other code in this method?

================
Comment at: lib/MC/MCELFStreamer.cpp:481
@@ -478,2 +480,3 @@
+                        Assembler.getBundleAlignSize() == 1U << AlignPow2))
     Assembler.setBundleAlignSize(1 << AlignPow2);
   else
----------------
s/1/1U/ for consistency with above?

http://reviews.llvm.org/D5801