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

tests/run-coverage/inline-dead.coverage

@@ -0,0 +1,28 @@
+    1|       |// Regression test for issue #98833.
+    2|       |// compile-flags: -Zinline-mir -Cdebug-assertions=off
+    3|       |
+    4|      1|fn main() {
+    5|      1|    println!("{}", live::<false>());
+    6|      1|
+    7|      1|    let f = |x: bool| {
+    8|       |        debug_assert!(
+    9|      0|            x
+   10|       |        );
+   11|      1|    };
+   12|      1|    f(false);
+   13|      1|}
+   14|       |
+   15|       |#[inline]
+   16|      1|fn live<const B: bool>() -> u32 {
+   17|      1|    if B {
+   18|      0|        dead()
+   19|       |    } else {
+   20|      1|        0
+   21|       |    }
+   22|      1|}
+   23|       |
+   24|       |#[inline]
+   25|      0|fn dead() -> u32 {
+   26|      0|    42
+   27|      0|}
+