[clang] [llvm] [clang-tools-extra] [lld] [libunwind] [lldb] [libcxx] [libc] [compiler-rt] [flang] Fix clang to recognize new C23 modifiers %w and %wf when printing (PR #71771)

[via cfe-commits]

================
@@ -286,7 +286,33 @@ 
clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
       lmKind = LengthModifier::AsInt3264;
       break;
     case 'w':
-      lmKind = LengthModifier::AsWide; ++I; break;
+      ++I;
+      if (I == E) return false;
+      if (*I == 'f') {
+        lmKind = LengthModifier::AsWideFast;
+        ++I;
+      } else {
+        lmKind = LengthModifier::AsWide;
+      }
+
+      if (I == E) return false;
+      int s = 0;
+      while (unsigned(*I - '0') <= 9) {
+        s = 10 * s + unsigned(*I - '0');
+        ++I;
+      }
+
+      // s == 0 is MSVCRT case, like l but only for c, C, s, S, or Z on windows
+      // s != 0 for b, d, i, o, u, x, or X when a size followed(like 8, 16, 32 
or 64)
+      if (s != 0) {
----------------
ZijunZhaoCCK wrote:

> Should we return false in the case s == 0?

This is incorrect. I already correct this on my local side but I haven't upload 
my change because I am still debugging the warning thing.

https://github.com/llvm/llvm-project/pull/71771
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