Fix endianness of compiled code and stacks of stubs for MIPS.

The gtests now all work on MIPS.

Change-Id: I2883ce002f23d75e700366014517c863fb626d09
diff --git a/src/compiler/codegen/mips/MipsRallocUtil.cc b/src/compiler/codegen/mips/MipsRallocUtil.cc
index 43fcc07..bd9f97e 100644
--- a/src/compiler/codegen/mips/MipsRallocUtil.cc
+++ b/src/compiler/codegen/mips/MipsRallocUtil.cc
@@ -138,20 +138,15 @@
 
 extern RegLocation oatGetReturnWideAlt(CompilationUnit* cUnit)
 {
-  RegLocation res = LOC_C_RETURN_WIDE_ALT;
-  oatClobber(cUnit, res.lowReg);
-  oatClobber(cUnit, res.highReg);
-  oatMarkInUse(cUnit, res.lowReg);
-  oatMarkInUse(cUnit, res.highReg);
-  oatMarkPair(cUnit, res.lowReg, res.highReg);
+  UNIMPLEMENTED(FATAL) << "No oatGetReturnWideAlt for MIPS";
+  RegLocation res = LOC_C_RETURN_WIDE;
   return res;
 }
 
 extern RegLocation oatGetReturnAlt(CompilationUnit* cUnit)
 {
-  RegLocation res = LOC_C_RETURN_ALT;
-  oatClobber(cUnit, res.lowReg);
-  oatMarkInUse(cUnit, res.lowReg);
+  UNIMPLEMENTED(FATAL) << "No oatGetReturnAlt for MIPS";
+  RegLocation res = LOC_C_RETURN;
   return res;
 }