[LLVM-C] Move DIBuilder Bindings For Temporary MDNodes

Summary: Move LLVMTemporaryMDNode and LLVMMetadataReplaceAllUsesWith to the C bindings and add LLVMDeleteTemporaryMDNode for deleting non-RAUW'ed temporary nodes.

Reviewers: whitequark, harlanhaskins, deadalnix

Reviewed By: whitequark

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D46632

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332010 91177308-0d34-0410-b5e6-96231b3b80d8