MIPS: Fix assertion in full codegen for holed 'this'.

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 4ad24e882984674342b859d7d09f44314b303b8c..dc4b40b34399c8e6fcb862dbe6e88c117dd2867a 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -1522,7 +1522,8 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
         if (var->scope()->DeclarationScope() != scope()->DeclarationScope()) {
           skip_init_check = false;
         } else if (var->is_this()) {
-          CHECK((info_->shared_info()->kind() & kSubclassConstructor) != 0);
+          CHECK(info_->function() != nullptr &&
+                (info_->function()->kind() & kSubclassConstructor) != 0);
           // TODO(dslomov): implement 'this' hole check elimination.
           skip_init_check = false;
         } else {