Adrian Prantl 56309f6b49 Debug Info: Store the SDK in the DICompileUnit. ...

This an intermediate step for PR44213
(https://bugs.llvm.org/show_bug.cgi?id=44213).

This stores the SDK *name* in the debug info, to make it possible to
`-fdebug-prefix-map`-replace the sysroot with a recognizable string and allowing
the debugger to find a fitting SDK relative to itself, not the machine the
executable was compiled on.

rdar://problem/51645582

2020-03-13 13:25:39 -07:00

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