Fix some tests to use -Cinstrument-coverage

Author: wesleywiser

src/test/run-make-fulldeps/coverage-reports/expected_show_coverage.issue-85461.txt

@@ -11,7 +11,7 @@
    10|      1|}
 
 ../coverage/lib/inline_always_with_dead_code.rs:
-    1|       |// compile-flags: -Zinstrument-coverage -Ccodegen-units=4 -Copt-level=0
+    1|       |// compile-flags: -Cinstrument-coverage -Ccodegen-units=4 -Copt-level=0
     2|       |
     3|       |#![allow(dead_code)]
     4|       |

src/test/run-make-fulldeps/coverage/lib/inline_always_with_dead_code.rs

@@ -1,4 +1,4 @@
-// compile-flags: -Zinstrument-coverage -Ccodegen-units=4 -Copt-level=0
+// compile-flags: -Cinstrument-coverage -Ccodegen-units=4 -Copt-level=0
 
 #![allow(dead_code)]
 

src/test/ui/issues/issue-85461.rs

@@ -1,4 +1,4 @@
-// compile-flags: -Zinstrument-coverage -Ccodegen-units=4 --crate-type dylib -Copt-level=0
+// compile-flags: -Cinstrument-coverage -Ccodegen-units=4 --crate-type dylib -Copt-level=0
 // build-pass
 // needs-profiler-support