[clang] Address a handful of C4146 compiler warnings where literals can be replaced with std::numeric_limits (PR #147623)

[Owen Pan via cfe-commits]

================
@@ -777,7 +779,7 @@ template <> struct MappingTraits<FormatStyle::SpacesInLineComment> {
     IO.mapOptional("Maximum", signedMaximum);
     Space.Maximum = static_cast<unsigned>(signedMaximum);
 
-    if (Space.Maximum != -1u)
+    if (Space.Maximum != std::numeric_limits<unsigned>::max())
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owenca wrote:

```suggestion
    if (Space.Maximum < UINT_MAX)
```
as that's what's used elsewhere in the file.

https://github.com/llvm/llvm-project/pull/147623