I'm writing a 'betterC' program and the compiler is generating a
call to '_memset64' if I have an array literal where the elements
are the same.
```
extern(C) void main() {
f([1, 1]);
}
void f(scope immutable ulong[] a) {}
```
Running `dmd -betterC app.d` fails with:
```
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld:
app.o: in function `main':
app.d:(.text.main[main]+0x24): undefined reference to `_memset64'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1
``
I don't want to link to additional libraries (planning to target
WASM). The code works if I write `ulong i = 1; f([i, i]);`, but
I'd rather the code worked without having to trick the compiler.
Is there a compiler flag I could set to prevent D from inserting
calls to '_memset64'?
