Replace NULL with nullptr

Also fixed some lines that were too long, and a few other minor
details.

Change-Id: I6efba5fb6e03eb5d0a300fddb2a75bf8e2f175cb
diff --git a/compiler/dex/quick/x86/int_x86.cc b/compiler/dex/quick/x86/int_x86.cc
index 2c13b61..943bfc0 100755
--- a/compiler/dex/quick/x86/int_x86.cc
+++ b/compiler/dex/quick/x86/int_x86.cc
@@ -1569,7 +1569,7 @@
   } else {
     OpTlsCmp(Thread::ThreadFlagsOffset<4>(), 0);
   }
-  return OpCondBranch((target == NULL) ? kCondNe : kCondEq, target);
+  return OpCondBranch((target == nullptr) ? kCondNe : kCondEq, target);
 }
 
 // Decrement register and branch on condition
@@ -3005,7 +3005,7 @@
 
   // Assume that there is no match.
   LoadConstant(result_reg, 0);
-  LIR* null_branchover = OpCmpImmBranch(kCondEq, object.reg, 0, NULL);
+  LIR* null_branchover = OpCmpImmBranch(kCondEq, object.reg, 0, nullptr);
 
   // We will use this register to compare to memory below.
   // References are 32 bit in memory, and 64 bit in registers (in 64 bit mode).