[PATCH][SH] Ensure that offset alignments are valid

[Andrew STUBBS]

Hi,

The attached patch adds an error message, to the SH assembler, rejecting 
all invalid BFD_RELOC_SH_PCRELIMM8BY4 relocations.

Specifically, the PC to destination offset must not be negative, and the 
destination must be 4-byte aligned.

At present, incorrect values are silently mis-assembled.

This patch has some fallout in the testsuite results (the arch tests use 
misaligned targets). I shall fix that up if this patch is OK.

Andrew Stubbs
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