[llvm-profdata] Resolve tilde for weighted input filenames (#146206)

When specifying a weighted input file, the shell does not automatically
expand the tilde (`~`) character in the filename because the argument
is passed as a single string in the format `<weight>,<filename>`.

This commit fixes the issue by using `llvm::sys::fs::expand_tilde` to
explicitly resolve the tilde in the filename, ensuring that paths
like `~/path/to/file` are correctly handled.

Author: kongy

llvm/tools/llvm-profdata/llvm-profdata.cpp

@@ -1705,7 +1705,10 @@ static WeightedFile parseWeightedFile(const StringRef &WeightedFilename) {
   if (WeightStr.getAsInteger(10, Weight) || Weight < 1)
     exitWithError("input weight must be a positive integer");
 
-  return {std::string(FileName), Weight};
+  llvm::SmallString<128> ResolvedFileName;
+  llvm::sys::fs::expand_tilde(FileName, ResolvedFileName);
+
+  return {std::string(ResolvedFileName), Weight};
 }
 
 static void addWeightedInput(WeightedFileVector &WNI, const WeightedFile &WF) {