Silence class vs. struct warnings (opt_pass, ipa_opt_pass_d)

[Oleg Endo]

Hi,

When building GCC on OSX with its native XCode/Clang tools, it outputs
quite some "struct X was previously declared as a class" or similar
warnings (-Wmismatched-tags is enabled by default).

The attached patch fixes this for class opt_pass and class
ipa_opt_pass_d by removing the redundant 'struct' tag which seems to be
a leftover from the plain C days.

Tested with make all-gcc.
OK for trunk?

Cheers,
Oleg

gcc/ChangeLog:
	* cgraphunit.c: Remove struct tags when referring to class
	ipa_opt_pass_d or class opt_pass.
	* function.h: Likewise.
	* lto-cgraph.c: Likewise.
	* pass_manager.h: Likewise.
	* passes.c: Likewise.
	* tree-pass.h: Likewise.
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