Revert "Add implicit null and stack checks for x86"

It breaks cross compilation with x86_64.

This reverts commit 34e826ccc80dc1cf7c4c045de6b7f8360d504ccf.

Change-Id: I34ba07821fc0a022fda33a7ae21850957bbec5e7
diff --git a/runtime/arch/mips/fault_handler_mips.cc b/runtime/arch/mips/fault_handler_mips.cc
index 5a64a69..1ecd7d9 100644
--- a/runtime/arch/mips/fault_handler_mips.cc
+++ b/runtime/arch/mips/fault_handler_mips.cc
@@ -29,8 +29,7 @@
 
 namespace art {
 
-void FaultManager::GetMethodAndReturnPCAndSP(siginfo_t* siginfo, void* context,
-                                             mirror::ArtMethod** out_method,
+void FaultManager::GetMethodAndReturnPCAndSP(void* context, mirror::ArtMethod** out_method,
                                              uintptr_t* out_return_pc, uintptr_t* out_sp) {
 }