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/mips/codegen_mips.h b/compiler/dex/quick/mips/codegen_mips.h
index 5089111..40641d6 100644
--- a/compiler/dex/quick/mips/codegen_mips.h
+++ b/compiler/dex/quick/mips/codegen_mips.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();