Revert "Change LLVM check for pending exception to use thread flags."

This reverts commit 2281a0ea6e3fbb7a26bd7ca030ee20296b8fed58

Change-Id: Iee5f99df242265528d9a363e302bb58811bda021
diff --git a/src/compiler_llvm/runtime_support_builder.cc b/src/compiler_llvm/runtime_support_builder.cc
index 9513d4a..169f8e8 100644
--- a/src/compiler_llvm/runtime_support_builder.cc
+++ b/src/compiler_llvm/runtime_support_builder.cc
@@ -147,12 +147,11 @@
 }
 
 llvm::Value* RuntimeSupportBuilder::EmitIsExceptionPending() {
-  Value* state_and_flags = EmitLoadFromThreadOffset(Thread::ThreadFlagsOffset().Int32Value(),
-                                                    irb_.getInt16Ty(),
-                                                    kTBAARuntimeInfo);
-  // Mask exception pending status and return true if non-zero.
-  Value* exception_pending = irb_.CreateAnd(state_and_flags, irb_.getInt16(kExceptionPending));
-  return irb_.CreateICmpNE(exception_pending, irb_.getInt16(0));
+  Value* exception = EmitLoadFromThreadOffset(Thread::ExceptionOffset().Int32Value(),
+                                              irb_.getJObjectTy(),
+                                              kTBAARuntimeInfo);
+  // If exception not null
+  return irb_.CreateIsNotNull(exception);
 }