Increase the maximum text size on ARM to 64MiB. Without this clang would be sent a SIGABRT when it is loaded as it is too large. This is the smallest power of two MiB value that allows us to execute clang.
Increase the maximum text size on ARM to 64MiB. Without this clang would be
sent a SIGABRT when it is loaded as it is too large. This is the smallest
power of two MiB value that allows us to execute clang.

While here wrap it in an #ifndef to be consistent with the other
architectures.

Submitted by:	Daisuke Aoyama <aoyama at peach.ne.jp>

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