[PATCH] x86: Change -malign-branch= to accept a comma separated list

[Fangrui Song via binutils]

It is a convention to use a comma separated list.

-fsanitize=address,undefined
-fsanitize=null,alignment
-fpatchable-function-entry=3,1
-finstrument-functions-exclude-function-list=a,b
-mrecip=all,!sqrt
-mfpmath=sse,387
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