Add arch-specific directory to search path

Summary:

This change adds an arch-specific subdirectory in <ResourceDir>/lib/<OS>
to the linker search path. This path also gets added as '-rpath' for
na

Add arch-specific directory to search path

Summary:

This change adds an arch-specific subdirectory in <ResourceDir>/lib/<OS>
to the linker search path. This path also gets added as '-rpath' for
native compilation if a runtime is linked in as a shared object. This
allows arch-specific libraries to be installed alongside clang.

Reviewers: danalbert, cbergstrom, javed.absar

Subscribers: srhines

Differential Revision: https://reviews.llvm.org/D30015

llvm-svn: 296927

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