MSP430: Add -mtiny-printf option

2019-11-04  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

gcc/
	* config.in: Regenerate.
	* config/msp430/msp430.c (msp430_option_override): Emit an error if
	-mtiny-printf is used without GCC being configured with
	--enable-newlib-nano-formatted-io.
	* config/msp430/msp430.h (LINK_SPEC): Pass 
	"--wrap puts --wrap printf" when -mtiny-printf is used.
	* config/msp430/msp430.opt: Document -mtiny-printf.
	* configure: Regenerate.
	* configure.ac: Enable --enable-newlib-nano-formatted-io flag.
	Define HAVE_NEWLIB_NANO_FORMATTED_IO if
	--enable-newlib-nano-formatted-io is passed.
	* doc/invoke.texi: Document -mtiny-printf.

gcc/testsuite/
	* gcc.target/msp430/tiny-printf.c: New test.

From-SVN: r277774