Go patch committed: Use backend interface for constant expressions

[Ian Lance Taylor]

This patch from Chris Manghane changes the Go frontend to use the
backend interface for global constants.  Bootstrapped and ran Go
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


2014-04-17  Chris Manghane  <cmang@google.com>

	* go-gcc.cc (Gcc_backend::named_constant_expression): New
	function.


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