MIPS: Save MSA extended context around signals

It is desirable for signal handlers to be allowed to make use of MSA,
particularly if auto vectorisation is used when compiling a program.
The MSA context must therefore be saved & restored before & after
invoking the signal handler. Make use of the extended context structs
defined in the preceding patch to save MSA context after the sigframe
when appropriate.

[[email protected]: Fixed conflicts.]

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Guenter Roeck <[email protected]>
Cc: Matthew Fortune <[email protected]>
Cc: Leonid Yegoshin <[email protected]>
Cc: [email protected]
Cc: Richard Weinberger <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Markos Chandras <[email protected]>
Cc: Manuel Lauss <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/10796/
Signed-off-by: Ralf Baechle <[email protected]>

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