Generate lint diagnostic message from BuiltinLintDiag

Translation of the lint message happens when the actual diagnostic is
created, not when the lint is buffered. Generating the message from
BuiltinLintDiag ensures that all required data to construct the message
is preserved in the LintBuffer, eventually allowing the messages to be
moved to fluent.

Remove the `msg` field from BufferedEarlyLint, it is either generated
from the data in the BuiltinLintDiag or stored inside
BuiltinLintDiag::Normal.

compiler/rustc_lint/messages.ftl

@@ -180,6 +180,9 @@ lint_deprecated_lint_name =
     .suggestion = change it to
     .help = change it to {$replace}
 
+lint_deprecated_where_clause_location =
+    where clause not allowed here
+
 lint_diag_out_of_impl =
     diagnostics should only be created in `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls
 
@@ -209,6 +212,8 @@ lint_expectation = this lint expectation is unfulfilled
     .note = the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message
     .rationale = {$rationale}
 
+lint_extern_without_abi = extern declarations without an explicit ABI are deprecated
+
 lint_for_loops_over_fallibles =
     for loop over {$article} `{$ty}`. This is more readably written as an `if let` statement
     .suggestion = consider using `if let` to clear intent
@@ -521,6 +526,12 @@ lint_path_statement_drop = path statement drops value
 
 lint_path_statement_no_effect = path statement with no effect
 
+lint_pattern_in_bodiless = patterns aren't allowed in functions without bodies
+    .label = pattern not allowed in function without body
+
+lint_pattern_in_foreign = patterns aren't allowed in foreign function declarations
+    .label = pattern not allowed in foreign function
+
 lint_ptr_null_checks_fn_ptr = function pointers are not nullable, so checking them for null will always return false
     .help = wrap the function pointer inside an `Option` and use `Option::is_none` to check for null pointer value
     .label = expression has type `{$orig_ty}`