[dsymutil] Upstream getBundleInfo implementation

This patch implements `getBundleInfo`, which uses CoreFoundation to
obtain information about the CFBundle. This information is needed to
populate the Plist in the dSYM bundle.

This change only applies to darwin and is an NFC as far as other
platforms are concerned.

Differential revision: https://reviews.llvm.org/D40244

llvm-svn: 319416