Saleem Abdulrasool 2d04b8491b stdlib: check for ARM/ARM64 more thoroughly (NFC) ...

Update the instances of checks for architectures to be more broad for different
spellings of the architecture macro.  Certain targets use `_M_ARM` and others
use `__arm__`.  Similarly, arm64/aarch64 has `_M_ARM64`, `__arm64__` and
`__aarch64__` as spellings.  This just mechanically goes through and encodes the
various spellings.

Take the opportunity to replace some raw checks with `defined` checks which
avoids a pedantic warning due to the undefined macro when performing the check
as the preprocessor may warn about an undefined condition evaluating to `0`.

2018-09-21 11:24:03 -07:00

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