Remove unnecessary code.
Remove unnecessary code.

The implementation searches for absolute paths to .swiftmodule files
in FileSpecs. This is not how we are supposed to find
.swiftmodules. We are supposed to find them via N_AST symbols, or via
dsymutil inside the ast section of the .dSYM.

rdar://problem/39962565

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb