coverage. Add coverage-options=mcdc as gate for MC/DC instrument

compiler/rustc_mir_build/messages.ftl

@@ -97,6 +97,8 @@ mir_build_deref_raw_pointer_requires_unsafe_unsafe_op_in_unsafe_fn_allowed =
     .note = raw pointers may be null, dangling or unaligned; they can violate aliasing rules and cause data races: all of these are undefined behavior
     .label = dereference of raw pointer
 
+mir_build_exceeds_mcdc_condition_num_limit =  Conditions number of the decision ({$conditions_num}) exceeds limit ({$max_conditions_num}). MCDC analysis will not count this expression.
+
 mir_build_extern_static_requires_unsafe =
     use of extern static is unsafe and requires unsafe block
     .note = extern statics are not controlled by the Rust type system: invalid data, aliasing violations or data races will cause undefined behavior

compiler/rustc_mir_build/src/errors.rs

@@ -818,6 +818,15 @@ pub struct NontrivialStructuralMatch<'tcx> {
     pub non_sm_ty: Ty<'tcx>,
 }
 
+#[derive(Diagnostic)]
+#[diag(mir_build_exceeds_mcdc_condition_num_limit)]
+pub(crate) struct MCDCExceedsConditionNumLimit {
+    #[primary_span]
+    pub span: Span,
+    pub conditions_num: usize,
+    pub max_conditions_num: usize,
+}
+
 #[derive(Diagnostic)]
 #[diag(mir_build_pattern_not_covered, code = E0005)]
 pub(crate) struct PatternNotCovered<'s, 'tcx> {