MSP430: Use default_elf_select_section to determine sections for data

MSP430: Use default_elf_select_section to determine sections for data

2019-09-03  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* config/msp430/msp430.c (msp430_init_sections): Remove handling of the
	noinit section.
	(msp430_select_section): Handle decls with the "noinit" attribute with
	default_elf_select_section.
	Handle SECCAT_RODATA_MERGE_* section types with
	default_elf_select_section.
	Add comments about handling of unsupported section types.
	(msp430_section_type_flags): Remove handling of the noinit section.

From-SVN: r275357