Rename ClobberCalleeSave to *Caller*, fix it for x86.

Change-Id: I6a72703a11985e2753fa9b4520c375a164301433
diff --git a/compiler/dex/quick/x86/target_x86.cc b/compiler/dex/quick/x86/target_x86.cc
index 878fa76..cbd0f15 100644
--- a/compiler/dex/quick/x86/target_x86.cc
+++ b/compiler/dex/quick/x86/target_x86.cc
@@ -350,10 +350,11 @@
 }
 
 /* Clobber all regs that might be used by an external C call */
-void X86Mir2Lir::ClobberCalleeSave() {
+void X86Mir2Lir::ClobberCallerSave() {
   Clobber(rAX);
   Clobber(rCX);
   Clobber(rDX);
+  Clobber(rBX);
 }
 
 RegLocation X86Mir2Lir::GetReturnWideAlt() {