Fix compiler_test for the LLVM route.

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

(cherry picked from commit 01ec16f67b383284ef386a898938a1fec0a89e29)

Change-Id: I4dc030fd8e611e93e93f3060e38cfe489d10b91f
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);