This PR fixes the warning message due to the non ISO standard usage of
`__FUNCTION__`
```
/home/lewuathe/llvm-project/mlir/test/CAPI/transform_interpreter.c: In function ‘testApplyNamedSequence’:
/home/lewuathe/llvm-project/mlir/test/CAPI/transform_interpreter.c:21:27: warning: ISO C does not support ‘__FUNCTION__’ predefined identifier [-Wpedantic]
21 | fprintf(stderr, "%s\n", __FUNCTION__);
|
```
As `__FUNCTION__` is another name of `__func__` and it conforms to the
specification. We should be able to use `__func__` here.
Ref:
https://stackoverflow.com/questions/52962812/how-to-silence-gcc-pedantic-wpedantic-warning-regarding-function
Compiler
```
Ubuntu clang version 18.1.3 (1)
Target: x86_64-pc-linux-gnu
```
