Add support for boolean literals in macros

[ivanaivanovska]

Adding support for macros with boolean literals.

Demo:

// main.carbon

library "Main";

import Core library "io";

import Cpp inline '''
  #define M_TRUE true
''';

fn Run() -> i32 {
  let a: bool = Cpp.M_TRUE;
  if (a) {
    Core.Print(1);
  } else {
    Core.Print(0);
  }
  return 0;
}

$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link main.o \--output=demo_carbon
$ ./demo_carbon
1

Part of #6303

[danakj]

LGTM

[danakj]

nit: We usually write the instruction type in the instruction-creating functions as an explicit template parameter. Why? Idk, I always have to move it to the {} when I have an error and need to see what it actually is. But I think clang-format does a nicer job with things that way, and by being consistent you can grep for <SemIR::SomeInstName to find where it's created.

Suggested change

	context, MakeImportedLocIdAndInst(
	context, imported_loc_id,
	SemIR::BoolLiteral{.type_id = type_id,
	context, MakeImportedLocIdAndInst<SemIR::BoolLiteral>(
	context, imported_loc_id,
	{.type_id = type_id,

Will probably need to reformat after