Remove -fshort-double

Remove -fshort-double

	PR target/60410
	* tree.c (build_common_tree_nodes): Remove short_double argument.
	All callers changed.
	* tree.h (build_common_tree_nodes): Adjust declaration.
	* doc/invoke.texi (-fshort-double): Remove documentation.
	* config/mips/t-img-elf (MULTILIB_OPTIONS, MULTILIB_DIRNAMES,
	MULTILIB_EXCEPTIONS): Remove -fshort-double variant.
	* lto-wrapper.c (merge_and_complain, append_compiler_options,
	append_linker_options): Don't handle OPT_fshort_double.

c-family/
	PR target/60410
	* c.opt (fshort-double): Remove.

testsuite/
	PR target/60410
	* gcc.dg/lto/pr55113_0.c: Remove test.

From-SVN: r233218