[AArch64] Run general SVE ACLE tests for C

[AArch64] Run general SVE ACLE tests for C

Now that the C frontend can cope with POLY_INT_CST-length initialisers,
we can make aarch64-sve-acle.exp run the full set of tests.  This will
introduce new failures for -mabi=ilp32; I'll make the testsuite ILP32
clean separately.

2019-12-02  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	* gcc.target/aarch64/sve/acle/aarch64-sve-acle.exp: Run the
	general/* tests too.

From-SVN: r278908