Add -mlong-double-64/-mlong-double-80 to i386

Add -mlong-double-64/-mlong-double-80 to i386

gcc/

	* doc/invoke.texi: Document -mlong-double-64/-mlong-double-80.

	* config/i386/i386.c (flag_opts): Add -mlong-double-64.
	(TARGET_HAS_BIONIC): Default long double to 64-bit for Bionic.

	* config/i386/i386.h (LONG_DOUBLE_TYPE_SIZE): Use 64 if
	TARGET_LONG_DOUBLE_64 is true.
	(LIBGCC2_LONG_DOUBLE_TYPE_SIZE): New macro.
	(WIDEST_HARDWARE_FP_SIZE): Defined to 80.

	* config/i386/i386.opt (mlong-double-80): New option.
	(mlong-double-64): Likewise.

	* config/i386/i386-c.c (ix86_target_macros): Define
	__LONG_DOUBLE_64__ for TARGET_LONG_DOUBLE_64.

gcc/testsuite/

	* gcc.target/i386/long-double-64-1.c: New file.
	* gcc.target/i386/long-double-64-2.c: Likewise.
	* gcc.target/i386/long-double-64-3.c: Likewise.
	* gcc.target/i386/long-double-64-4.c: Likewise.
	* gcc.target/i386/long-double-80-1.c: Likewise.
	* gcc.target/i386/long-double-80-2.c: Likewise.
	* gcc.target/i386/long-double-80-3.c: Likewise.
	* gcc.target/i386/long-double-80-4.c: Likewise.
	* gcc.target/i386/long-double-80-5.c: Likewise.
	* gcc.target/i386/long-double-80-6.c: Likewise.
	* gcc.target/i386/long-double-80-7.c: Likewise.

libgcc/

	* config/i386/t-linux (HOST_LIBGCC2_CFLAGS): New.

From-SVN: r190599