Cleanly setting C compiler options when building RTS

[Siddharth Bhat]

Hello all,

I was interested in building the GHC RTS with GCC's AddressSanitizer and
Ubsan enabled.

What I want to do very specifically is to pass "-fsanitize=address
-fsanitize=undefined" when compiling the RTS.

What's the "correct" way to set this up in the build system? Is there a
configure flag? Do I need to change the Shake script?
Thanks,
~Siddharth
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