[llvm-profdata] Make -debug-info visible

[kyulee]

Summary

Add the option comment in .rst.

[ellis]

llvm/docs/CommandGuide/llvm-profdata.rst

190–192

[kyulee]

Update the comment.

[MaskRay]

llvm/docs/CommandGuide/llvm-profdata.rst

190

markdown single quote translates to double-quote in rst. I changed it in dd2fbbbb2d277a5dd497edbd01b1fcd469e65f53

[MaskRay]

LGTM

llvm/docs/CommandGuide/llvm-profdata.rst

  threshold got from profile summary.
 
 .. option:: -suppl-min-size-threshold=threshold_int_number
 
  If the size of a function is smaller than the threshold, assume it can be
  inlined by PGO early inliner and it will not be adjusted based on sample
  profile.
 
+.. option:: -debug-info=path
+
+ Specify the executable or `.dSYM` that contains debug info for the raw profile.
+ When `-debug-info-correlate` was used for instrumentation, use this option
+ to correlate the raw profile.
+
+
 EXAMPLES
 ^^^^^^^^
 Basic Usage
 +++++++++++
 Merge three profiles:
 
 ::
 

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

static int merge_main(int argc, const char *argv[]) {
   cl::opt<unsigned> InstrProfColdThreshold(
       "instr-prof-cold-threshold", cl::init(0), cl::Hidden,
       cl::desc("User specified cold threshold for instr profile which will "
                "override the cold threshold got from profile summary. "));
   cl::opt<bool> GenCSNestedProfile(
       "gen-cs-nested-profile", cl::Hidden, cl::init(false),
       cl::desc("Generate nested function profiles for CSSPGO"));
   cl::opt<std::string> DebugInfoFilename(
-      "debug-info", cl::init(""), cl::Hidden,
+      "debug-info", cl::init(""),
       cl::desc("Use the provided debug info to correlate the raw profile."));
 
   cl::ParseCommandLineOptions(argc, argv, "LLVM profile data merger\n");
 
   WeightedFileVector WeightedInputs;
   for (StringRef Filename : InputFilenames)
     addWeightedInput(WeightedInputs, {std::string(Filename), 1});
   for (StringRef WeightedFilename : WeightedInputFilenames)