Bring trunk HdrSrc.hdr.Macros in line with Cortex version
Detail: * LD macro updated to know about LDRH and LDRD instructions * LDW macro updated: safe to use on last word of a page; no longer enforces relative order of temporary registers; uses unaligned loads when possible; uses 1 fewer instructions if ARMv6 compatibility is not required; scheduled for XScale and Cortex-A8 Admin: Tested with BASIC softload on RISC OS 5.12 Iyonix. Fixes bug #220 Version 1.72. Tagged as 'HdrSrc-1_72'
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