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/fp_x86.cc b/compiler/dex/quick/x86/fp_x86.cc
index 10af31a..8e81746 100755
--- a/compiler/dex/quick/x86/fp_x86.cc
+++ b/compiler/dex/quick/x86/fp_x86.cc
@@ -484,13 +484,13 @@
   } else {
     NewLIR2(kX86UcomisdRR, rl_src1.reg.GetReg(), rl_src2.reg.GetReg());
   }
-  LIR* branch = NULL;
+  LIR* branch = nullptr;
   if (unordered_gt) {
     branch = NewLIR2(kX86Jcc8, 0, kX86CondPE);
   }
   // If the result reg can't be byte accessed, use a jump and move instead of a set.
   if (!IsByteRegister(rl_result.reg)) {
-    LIR* branch2 = NULL;
+    LIR* branch2 = nullptr;
     if (unordered_gt) {
       branch2 = NewLIR2(kX86Jcc8, 0, kX86CondA);
       NewLIR2(kX86Mov32RI, rl_result.reg.GetReg(), 0x0);
@@ -513,7 +513,7 @@
                                      bool is_double) {
   LIR* taken = &block_label_list_[bb->taken];
   LIR* not_taken = &block_label_list_[bb->fall_through];
-  LIR* branch = NULL;
+  LIR* branch = nullptr;
   RegLocation rl_src1;
   RegLocation rl_src2;
   if (is_double) {