Remove kExceptionPending flag from thread and codegen.

Code just checks if exception_ is NULL instead. Compiled code simply
clears the exception_ field for MOVE_EXCEPTION instead of calling a
helper.

Change-Id: Iefaa780f66c327c3d20598bd71d3c14d7a9c8119
diff --git a/src/compiler/codegen/codegen.h b/src/compiler/codegen/codegen.h
index 7a85ce8..595a1db 100644
--- a/src/compiler/codegen/codegen.h
+++ b/src/compiler/codegen/codegen.h
@@ -130,7 +130,6 @@
     void GenConstClass(CompilationUnit* cu, uint32_t type_idx, RegLocation rl_dest);
     void GenConstString(CompilationUnit* cu, uint32_t string_idx, RegLocation rl_dest);
     void GenNewInstance(CompilationUnit* cu, uint32_t type_idx, RegLocation rl_dest);
-    void GenMoveException(CompilationUnit* cu, RegLocation rl_dest);
     void GenThrow(CompilationUnit* cu, RegLocation rl_src);
     void GenInstanceof(CompilationUnit* cu, uint32_t type_idx, RegLocation rl_dest,
                        RegLocation rl_src);
@@ -332,6 +331,7 @@
     virtual void GenMemBarrier(CompilationUnit* cu, MemBarrierKind barrier_kind) = 0;
     virtual void GenMonitorEnter(CompilationUnit* cu, int opt_flags, RegLocation rl_src) = 0;
     virtual void GenMonitorExit(CompilationUnit* cu, int opt_flags, RegLocation rl_src) = 0;
+    virtual void GenMoveException(CompilationUnit* cu, RegLocation rl_dest) = 0;
     virtual void GenMultiplyByTwoBitMultiplier(CompilationUnit* cu, RegLocation rl_src,
                                                RegLocation rl_result, int lit, int first_bit,
                                                int second_bit) = 0;