remove -O

Author: tgross35

tests/codegen/float/f16-f128-inline.rs

@@ -1,5 +1,5 @@
 //@ revisions: default nopt
-//@[nopt] compile-flags: -O -Zcross-crate-inline-threshold=never -Zmir-opt-level=0 -Cno-prepopulate-passes
+//@[nopt] compile-flags: -Zcross-crate-inline-threshold=never -Zmir-opt-level=0 -Cno-prepopulate-passes
 
 // Ensure that functions using `f16` and `f128` are always inlined to avoid crashes
 // when the backend does not support these types.