Auto merge of #130389 - Luv-Ray:LLVMMDNodeInContext2, r=nikic

llvm: replace some deprecated functions

`LLVMMDStringInContext` and `LLVMMDNodeInContext` are deprecated, replace them with `LLVMMDStringInContext2` and `LLVMMDNodeInContext2`.
Also replace `Value` with `Metadata` in some function signatures for better consistency.

compiler/rustc_codegen_ssa/src/traits/builder.rs

@@ -51,6 +51,7 @@ pub trait BuilderMethods<'a, 'tcx>:
     type CodegenCx: CodegenMethods<
             'tcx,
             Value = Self::Value,
+            Metadata = Self::Metadata,
             Function = Self::Function,
             BasicBlock = Self::BasicBlock,
             Type = Self::Type,