Migrate most of the existing coverage tests over to run-coverage

Author: Zalathar

tests/run-make/coverage-reports/expected_show_coverage.abort.txt renamed to tests/run-coverage/abort.coverage

@@ -1,5 +1,5 @@
     1|       |#![allow(unused_assignments)]
-    2|       |// expect-exit-status-101
+    2|       |// failure-status: 101
     3|       |
     4|      4|fn might_fail_assert(one_plus_one: u32) {
     5|      4|    println!("does 1 + 1 = {}?", one_plus_one);

tests/run-make/coverage/abort.rs renamed to tests/run-coverage/abort.rs

@@ -1,5 +1,5 @@
 #![allow(unused_assignments)]
-// expect-exit-status-101
+// failure-status: 101
 
 fn might_fail_assert(one_plus_one: u32) {
     println!("does 1 + 1 = {}?", one_plus_one);

tests/run-make/coverage-reports/expected_show_coverage.assert.txt renamed to tests/run-coverage/assert.coverage

@@ -1,6 +1,6 @@
     1|       |#![allow(unused_assignments, unused_variables)]
-    2|       |// compile-flags: -C opt-level=2 # fix described in rustc_middle/mir/mono.rs
-    3|      1|fn main() {
+    2|       |// compile-flags: -C opt-level=2
+    3|      1|fn main() { // ^^ fix described in rustc_middle/mir/mono.rs
     4|      1|    // Initialize test constants in a way that cannot be determined at compile time, to ensure
     5|      1|    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from
     6|      1|    // dependent conditions.

tests/run-make/coverage/assert.rs renamed to tests/run-coverage/assert.rs

@@ -1,6 +1,6 @@
 #![allow(unused_assignments, unused_variables)]
-// compile-flags: -C opt-level=2 # fix described in rustc_middle/mir/mono.rs
-fn main() {
+// compile-flags: -C opt-level=2
+fn main() { // ^^ fix described in rustc_middle/mir/mono.rs
     // Initialize test constants in a way that cannot be determined at compile time, to ensure
     // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from
     // dependent conditions.