Fix spelling in comments in C source files (gold)

Fix spelling in comments in C source files (gold)

	* aarch64.cc: Fix spelling in comments.
	* arm.cc: Fix spelling in comments.
	* icf.cc: Fix spelling in comments.
	* layout.cc: Fix spelling in comments.
	* layout.h: Fix spelling in comments.
	* mips.cc: Fix spelling in comments.
	* output.h: Fix spelling in comments.
	* plugin.h: Fix spelling in comments.
	* script-sections.h: Fix spelling in comments.
	* script.h: Fix spelling in comments.
	* stringpool.h: Fix spelling in comments.
	* tilegx.cc: Fix spelling in comments.