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Replaced LSL, LSR, etc, macros with myLSL, myLSR, etc. because the old macro
names will clash with pseudo-opcodes that ARM have introduced which in turn will
be supported by newer assemblers.

Admin: this will cause some components to fail to build, especially with the
existing toolchain. If you see these failures, simply replace any uses of these
shift macros with the renamed 'my' shift macros (which are functionally identical).

Version 1.79. Tagged as 'HdrSrc-1_79'