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Ivana Ivanovska
3b0dad9dd5
Adds support for object-like macros with a single replacement
numeric-literal kind token. Only macros that evaluate to an integer
constant are supported for now. When detected at name lookup, they are
imported as a constant integer value in Carbon.
Demo:
```c++
// --- macros.h
#define CONFIG_VALUE 2
```
``` c++
// main.carbon
library "Main";
import Cpp library "macros.h";
import Core library "io";
fn Run() {
let a: i32 = Cpp.CONFIG_VALUE;
Core.Print(a);
}
```
```c++
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link main.o \--output=demo_carbon
$ ./demo_carbon
2
```
Part of #6303