LTO API: add lto_module_create_from_memory_with_path.

[Manman Ren]

Hi all,

This function adds an extra path argument to lto_module_create_from_memory.
The path argument will be passed to makeBuffer to make sure the MemoryBuffer
has a name and the created module has a module identifier. Modules created
by lto_module_create_from_memory will have empty module identifiers.

This is mainly for emitting warning messages from the linker. When we emit
warning message on one module, we can then use its module identifier.

LTO_API_VERSION is bumped to 9.

Thanks,
Manman
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