re PR target/78838 (msp430 option -mcode-region=either, -ffunction-sections, and interrupt function attributes cause incorrect section to be created)

	PR target/78838
gcc	* config/msp430/msp430.c (gen_prefix): Return NULL when section name is
	.lowtext.
	(has_section_name): New function.

testsuite * gcc.target/msp430/interrupt_fn_placement.c: New test.

From-SVN: r248674