[LLVM-C] Expose functions to create debug locations via DIBuilder.
These include:
- Several functions for creating an LLVMDIBuilder,
- LLVMDIBuilderCreateCompileUnit,
- LLVMDIBuilderCreateFile,
- LLVMDIBuilderCreateDebugLocation.
Patch by Harlan Haskins.
Differential Revision: https://reviews.llvm.org/D32368
llvm-svn: 317135