[D] Fix IdentityExp comparison for complex floats.

[D] Fix IdentityExp comparison for complex floats.

gcc/d/ChangeLog:

2019-01-20  Johannes Pfau  <johannespfau@gmail.com>

	* expr.cc (build_float_identity): New function.
	(ExprVisitor::visit(IdentityExp)): Add support for complex types.

gcc/testsuite/ChangeLog:

2019-01-20  Johannes Pfau  <johannespfau@gmail.com>

	* gdc.dg/runnable.d: Add tests for comparing complex types.

From-SVN: r268103