Migrate rustc_mir_dataflow to diagnostic structs

compiler/rustc_error_messages/locales/en-US/rustc_mir_dataflow.ftl

@@ -0,0 +1,29 @@
+rustc_mir_dataflow_path_must_end_in_filename =
+    path must end in a filename
+
+rustc_mir_dataflow_unknown_formatter =
+    unknown formatter
+
+rustc_mir_dataflow_duplicate_values_for =
+    duplicate values for `{$name}`
+
+rustc_mir_dataflow_requires_an_argument =
+    `{$name}` requires an argument
+
+rustc_mir_dataflow_stop_after_dataflow_ended_compilation =
+    stop_after_dataflow ended compilation
+
+rustc_mir_dataflow_peek_must_be_place_or_ref_place =
+    rustc_peek: argument expression must be either `place` or `&place`
+
+rustc_mir_dataflow_peek_must_be_not_temporary =
+    dataflow::sanity_check cannot feed a non-temp to rustc_peek.
+
+rustc_mir_dataflow_peek_bit_not_set =
+    rustc_peek: bit not set
+
+rustc_mir_dataflow_peek_argument_not_a_local =
+    rustc_peek: argument was not a local
+
+rustc_mir_dataflow_peek_argument_untracked =
+    rustc_peek: argument untracked

compiler/rustc_error_messages/src/lib.rs

@@ -43,6 +43,7 @@ fluent_messages! {
     passes => "../locales/en-US/passes.ftl",
     privacy => "../locales/en-US/privacy.ftl",
     typeck => "../locales/en-US/typeck.ftl",
+    rustc_mir_dataflow => "../locales/en-US/rustc_mir_dataflow.ftl",
 }
 
 pub use fluent_generated::{self as fluent, DEFAULT_LOCALE_RESOURCES};