Fix compiler_test for the LLVM route.

Stack operation was changed. The LLVM side is fixed accordingly.

Change-Id: I7e196aa3f8c142945fd1a34e5714d4c8d52830c8
diff --git a/src/stub_x86.cc b/src/stub_x86.cc
index d7b071b..b07cfea 100644
--- a/src/stub_x86.cc
+++ b/src/stub_x86.cc
@@ -65,8 +65,7 @@
 
 #if defined(ART_USE_LLVM_COMPILER)
   // Return to caller who will handle pending exception.
-  __ addl(ESP, Immediate(28));
-  __ popl(EBX);
+  __ addl(ESP, Immediate(32));
   __ popl(EBP);
   __ popl(ESI);
   __ popl(EDI);