MIPS: Small fix for r11771 (1b74d45b).

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index aeaed48c4d597aa4c2392f85e406fc712e808290..967ce4a605b43ae6fff48cc923b4606d41a5f8fa 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -2702,7 +2702,7 @@ Handle<Code> StoreStubCompiler::CompileStoreViaSetter(
                       CALL_AS_METHOD);
 
     // We have to return the passed value, not the return value of the setter.
-    __ pop(a0);
+    __ pop(v0);
 
     // Restore context register.
     __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));