Remove extra tests.

tests/ui/invalid-compile-flags/fuel.rs

@@ -1,11 +0,0 @@
-//@ revisions: incremental threads
-//@ dont-check-compiler-stderr
-//
-//@ [threads] compile-flags: -Zfuel=a=1 -Zthreads=2
-//@ [threads] error-pattern:optimization fuel is incompatible with multiple threads
-//
-//@ [incremental] incremental
-//@ [incremental] compile-flags: -Zprint-fuel=a
-//@ [incremental] error-pattern:optimization fuel is incompatible with incremental compilation
-
-fn main() {}