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/mips/call_mips.cc b/compiler/dex/quick/mips/call_mips.cc
index 05570e4..39b9cc7 100644
--- a/compiler/dex/quick/mips/call_mips.cc
+++ b/compiler/dex/quick/mips/call_mips.cc
@@ -112,7 +112,7 @@
   // Test loop.
   RegStorage r_key = AllocTemp();
   LIR* loop_label = NewLIR0(kPseudoTargetLabel);
-  LIR* exit_branch = OpCmpBranch(kCondEq, r_base, r_end, NULL);
+  LIR* exit_branch = OpCmpBranch(kCondEq, r_base, r_end, nullptr);
   Load32Disp(r_base, 0, r_key);
   OpRegImm(kOpAdd, r_base, 8);
   OpCmpBranch(kCondNe, rl_src.reg, r_key, loop_label);
@@ -188,7 +188,7 @@
   tab_rec->anchor = base_label;
 
   // Bounds check - if < 0 or >= size continue following switch.
-  LIR* branch_over = OpCmpImmBranch(kCondHi, r_key, size-1, NULL);
+  LIR* branch_over = OpCmpImmBranch(kCondHi, r_key, size-1, nullptr);
 
   // Materialize the table base pointer.
   RegStorage r_base = AllocPtrSizeTemp();