[flang] Fix narrowing warning on macos
With clang 11 on macos we were getting this warning:
```
flang/runtime/random.cpp:61:30: error: non-constant-expression cannot be narrowed from type 'unsigned long long' to 'runtime::GeneratedWord' (aka 'unsigned int') in initializer list [-Wc++11-narrowing]
GeneratedWord word{(generator() - generator.min()) & rangeMask};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
flang/runtime/random.cpp:99:5: note: in instantiation of function template specialization 'runtime::Generate<double, 53>' requested here
Generate<CppTypeFor<TypeCategory::Real, 8>, 53>(harvest);
^
```
Changing the type of `rangeMask` fixes it.
Differential Revision: https://reviews.llvm.org/D100320
diff --git a/flang/runtime/random.cpp b/flang/runtime/random.cpp
index b5158d0..4d2297a 100644
--- a/flang/runtime/random.cpp
+++ b/flang/runtime/random.cpp
@@ -57,7 +57,7 @@
Int fraction{generator()};
if constexpr (words > 1) {
for (std::size_t k{1}; k < words; ++k) {
- static constexpr Int rangeMask{(Int{1} << rangeBits) - 1};
+ static constexpr auto rangeMask{(GeneratedWord{1} << rangeBits) - 1};
GeneratedWord word{(generator() - generator.min()) & rangeMask};
fraction = (fraction << rangeBits) | word;
}
