Use LIRSlowPath for throwing NPE.

Get rid of launchpads for throwing NPE and use LIRSlowPath instead.
Also clean up some code of using LIRSlowPath for checking div
by zero.

Bug: 13170824

Change-Id: I0c20a49c39feff3eb1f147755e557d9bc0ff15bb
diff --git a/compiler/dex/quick/arm/codegen_arm.h b/compiler/dex/quick/arm/codegen_arm.h
index 13fa635..b0bc11d 100644
--- a/compiler/dex/quick/arm/codegen_arm.h
+++ b/compiler/dex/quick/arm/codegen_arm.h
@@ -131,7 +131,7 @@
     RegLocation GenDivRem(RegLocation rl_dest, RegStorage reg_lo, RegStorage reg_hi, bool is_div);
     RegLocation GenDivRemLit(RegLocation rl_dest, RegStorage reg_lo, int lit, bool is_div);
     void GenCmpLong(RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2);
-    void GenDivZeroCheck(RegStorage reg);
+    void GenDivZeroCheckWide(RegStorage reg);
     void GenEntrySequence(RegLocation* ArgLocs, RegLocation rl_method);
     void GenExitSequence();
     void GenSpecialExitSequence();
diff --git a/compiler/dex/quick/arm/int_arm.cc b/compiler/dex/quick/arm/int_arm.cc
index 8b4171d..c876b3a 100644
--- a/compiler/dex/quick/arm/int_arm.cc
+++ b/compiler/dex/quick/arm/int_arm.cc
@@ -911,12 +911,12 @@
   }
 }
 
-void ArmMir2Lir::GenDivZeroCheck(RegStorage reg) {
+void ArmMir2Lir::GenDivZeroCheckWide(RegStorage reg) {
   DCHECK(reg.IsPair());   // TODO: support k64BitSolo.
   RegStorage t_reg = AllocTemp();
   NewLIR4(kThumb2OrrRRRs, t_reg.GetReg(), reg.GetLowReg(), reg.GetHighReg(), 0);
   FreeTemp(t_reg);
-  AddDivZeroSlowPath(kCondEq);
+  GenDivZeroCheck(kCondEq);
 }
 
 // Test suspend flag, return target of taken suspend branch