LIT argument --incremental is deprecated

```
WARNING: --incremental is deprecated. Failing tests now always run first.
```

Author: shahmishal

test/CMakeLists.txt

@@ -128,11 +128,7 @@ endfunction()
 
 set(LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
 
-# Incremental mode in lit orders test files by the last modification time
-# instead of by the path, which is good for CI. In this mode lit also updates
-# the mtime on the failed tests, which makes them run first on the
-# consecutive execution, which makes local builds fail faster.
-set(SWIFT_LIT_ARGS "--incremental" CACHE STRING "Arguments to pass to lit")
+set(SWIFT_LIT_ARGS "" CACHE STRING "Arguments to pass to lit")
 
 set(SWIFT_LIT_ENVIRONMENT "" CACHE STRING "Environment to use for lit invocations")