Rename ARM assembler push/pull macros

The ARM assembler library functions use a macro called "push" that
along with a macro called "pull" is used to shift bytes around in a
word in an endian-independent way. However, the modern unified
ARM assembler syntax also defines the instruction "push" to push
data onto the stack, which has specific encodings in the Thumb2
instruction set. For prevent possible conflicts going forward, and
to allow the use of the more transparent "push" instruction along
with the modern unified assembler syntax, this patch renames all
occurrences of the "push" macro to "pushbits", as well as renaming
the macro argument, when also called "push", to "pushshift".

For consistency, the macro called "pull" with its argument name
"pull" are also renamed to "pullbits" and "pullshift", respectively.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>

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