Fix build issues with arm clang compiler for mec17xx platforms

[galak]

There are a number of different failures we see when building the arm clang compiler when building the mec17xx platforms.

[galak]

Some backports of fixes made upstream to fix building:
#56046
#56045

[galak]

Backport #56577 to fix init order issue w/arm-clang.

[galak]

Backport #50049 to fix build warnings/errors with arm-clang. Really just need commit f5e8927.

[galak]

Backport 49899 as start of fixing some linker issues w/arm-clang and logging.