[CIR] Upstream function call support

### Overview
Upstream support for call statments expressions and the cir.call operation.

### Suggested minimal test case
```
void f1();
void f2() {
  f1();
}
```

### Existing incubator tests
clang/test/CIR/CodeGen/call.cpp
clang/test/CIR/CodeGen/call.c
