[PATCH] Emit diagnostic for -munaligned-access on v6m

[Charlie Turner]

Hi,

The following command correctly produces a diagnostic that specifying
-munaligned-access for a v6M core is an error,

clang -c -target thumbv6m-none-linux-eabi -mcpu=cortex-m0 -munaligned-access
empty.c

But the next command does not,

clang -c -target thumb-none-linux-eabi -mcpu=cortex-m0 -munaligned-access
empty.c

In the second command, "thumv6m" has been replaced with "thumb". 

This patch causes the second command to issue the same diagnostic as the
first.

Please find the patch attached.

Thanks,
Charlie.
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