PPC: [runtime] Throw exception for derived constructors in correct context.
Port c86f1897 Original commit message: When derived constructors return a non-object (or not undefined) we currently throw an exception directly in the callee context. This was achieved by desugaring the return statement for derived classes. To be spec compliamnt a separate ConstructStubForDerived is introduced. Instead of trowing directly, the desugared return statement inside a derived constructor only returns an integer to indicate an incompatible result. R=cbruni@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com BUG=v8:4509 LOG=n Review URL: https://codereview.chromium.org/1595593002 Cr-Commit-Position: refs/heads/master@{#33341}
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