c: aarch64: Add FMV diagnostic tests.

c: aarch64: Add FMV diagnostic tests.

Adds c fmv diagnostic tests for aarch64.

This mostly tests c front end code, but has to be target specific as FMV
requires specifying target extensions.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/mv-and-mvc-error1.c: New test.
	* gcc.target/aarch64/mv-and-mvc-error2.c: New test.
	* gcc.target/aarch64/mv-and-mvc-error3.c: New test.
	* gcc.target/aarch64/mv-error1.c: New test.
	* gcc.target/aarch64/mv-error2.c: New test.
	* gcc.target/aarch64/mv-error3.c: New test.
	* gcc.target/aarch64/mv-error4.c: New test.
	* gcc.target/aarch64/mv-error5.c: New test.
	* gcc.target/aarch64/mv-error6.c: New test.
	* gcc.target/aarch64/mv-error7.c: New test.
	* gcc.target/aarch64/mv-error8.c: New test.
	* gcc.target/aarch64/mv-error9.c: New test.
	* gcc.target/aarch64/mv-error10.c: New test.
	* gcc.target/aarch64/mvc-error1.c: New test.
	* gcc.target/aarch64/mvc-error2.c: New test.
	* gcc.target/aarch64/mvc-warning1.c: New test.