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Ivana Ivanovska
109e39c75c
Adding support for macros that evaluate to nullptr literal.
Demo:
```c++
// macros.h
void foo(int a[2]);
#define MyNullPtr nullptr
```
```c++
// macros.cpp
void foo(int a[2]) {
if (!a) {
printf("array a is nullptr\n");
return;
}
printf("a[0] = %d \n", a[0]);
}
```
```c++
// main.carbon
library "Main";
import Cpp library "macros.h";
fn Run() -> i32 {
Cpp.foo(Cpp.MyNullPtr);
return 0;
}
```
```
$ clang -c macros.cpp;
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link macros.o main.o \--output=demo_carbon
$ ./demo_carbon
array a is nullptr
```
Part of #6303