Go patch committed: Avoid some compiler crashes

[Ian Lance Taylor]

This patch to the Go frontend avoids some compiler crashes on erroneous
code.  Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline.

Ian


2012-01-21  Ian Lance Taylor  <iant@google.com>

	* go-gcc.cc (Gcc_backend::type_size): Check for error_mark_node.
	(Gcc_backend::type_alignment): Likewise.
	(Gcc_backend::type_field_alignment): Likewise.
	(Gcc_backend::type_field_offset): Likewise.


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