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

src/mips64/full-codegen-mips64.cc

Index: src/mips64/full-codegen-mips64.cc
diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc
index 7aeb11839d5d91f9e8806bf9739d6105d51eddd3..2653728d296c8854dbf48d59b02521d503e59473 100644
--- a/src/mips64/full-codegen-mips64.cc
+++ b/src/mips64/full-codegen-mips64.cc
@@ -1519,7 +1519,8 @@ 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 {