[PATCH] [MSP430] Extend MSP430 data attribute handler

[Jozef Lawrynowicz]

The "persistent" and "noinit" data attributes for MSP430 assign the variable
they are applied to to the .persistent and .noinit sections, respectively.

The following patch extends the handler for these attributes to check for
misuse.

The testsuite updates add tests for these attributes, and some other MSP430
attributes, which previously did not have tests.

Ok for trunk?

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