MIPS: Compute correct contextual load ICs in fullcodegen.

Port 7ee31a23

BUG=
R=dusan.milosavljevic@imgtec.com

Review URL: https://codereview.chromium.org/969803002

Cr-Commit-Position: refs/heads/master@{#26946}

src/mips/full-codegen-mips.cc

@@ -1513,7 +1513,7 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
         __ li(VectorLoadICDescriptor::SlotRegister(),
               Operand(SmiFromSlot(proxy->VariableFeedbackSlot())));
       }
-      CallLoadIC(CONTEXTUAL);
+      CallGlobalLoadIC(var->name());
       context()->Plug(v0);
       break;
     }

src/mips64/full-codegen-mips64.cc

@@ -1511,7 +1511,7 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
         __ li(VectorLoadICDescriptor::SlotRegister(),
               Operand(SmiFromSlot(proxy->VariableFeedbackSlot())));
       }
-      CallLoadIC(CONTEXTUAL);
+      CallGlobalLoadIC(var->name());
       context()->Plug(v0);
       break;
     }