[XRay] Set an explicit dependency on libc++ when needed

Description

[XRay] Set an explicit dependency on libc++ when needed

When XRay is being built as part of the just built compiler together
with libc++ as part of the runtimes build, we need an explicit
dependency from XRay to libc++ to make sure that the library is
available by the time we start building XRay.

Differential Revision: https://reviews.llvm.org/D48113

Details

Committed
phosekWed, Jun 13, 12:08 AM
Differential Revision
D48113: [XRay] Set an explicit dependency on libc++ when needed
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