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This patch to the Go frontend by Cherry Zhang fixes the compiler to avoid a double evaluation of an interface field expression. In Interface_field_reference_expression, the interface expression is used in two places, so a temporary variable is used. Previously, we used a Set_and_use_temporary_expression, which, when evaluated twice, causes double evaluation of the underlying expression. Fix by setting the temporary once and use Temporary_reference_expression instead. This fixes https://golang.org/issue/26248. The test case for this is in https://golang.org/cl/122757. Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu. Committed to mainline. Ian
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