Implement METADATA_ASSIGN_ID (DIAssignID)

[RyanGlScott]

This was introduced in LLVM 17.0 in llvm/llvm-project@a2620e0. See this post for the motivation behind DIAssignID. A small example of this in the wild can be seen here:

__attribute__((__noinline__)) void f(int* x) {}

int main(void) {
  int x;
  f(&x);
  return 0;
}

If you compile this with:

$ clang -c -emit-llvm -g -O1 test.c

Then llvm-pretty-bc-parser will fail to load it:

λ> parseBitCodeFromFile "test.bc" >>= putStrLn . either formatError show
unknown record code: 47
from:
	METADATA_BLOCK
	@main
	FUNCTION_BLOCK
	FUNCTION_BLOCK_ID
	value symbol table
	MODULE_BLOCK
	Bitstream