[Support] Make printAllJSONValues public, for custom output.

Summary:
This changes the static method TimerGroup::printAllJSONValues from private to
public, to match the static method TimerGroup::printAll. When trying to drive
the reporting machinery by hand, the existing API is _almost_ flexible enough,
but this entrypoint is required to intermix printing timers with other
non-timer output.

The underlying motive here is a Swift change to consolidate the collection of
timers, LLVM statistics and other (non-assert-dependent) counters into JSON
files, which requires a bit of manual intervention in LLVM's stat and timer
output routines. See swiftlang/swift#8477 for details.

Reviewers: MatzeB

Reviewed By: MatzeB

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31566

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299371 91177308-0d34-0410-b5e6-96231b3b80d8

Author: graydon

include/llvm/Support/Timer.h

@@ -207,6 +207,9 @@ class TimerGroup {
   /// This static method prints all timers and clears them all out.
   static void printAll(raw_ostream &OS);
 
+  /// Prints all timers as JSON key/value pairs, and clears them all out.
+  static const char *printAllJSONValues(raw_ostream &OS, const char *delim);
+
   /// Ensure global timer group lists are initialized. This function is mostly
   /// used by the Statistic code to influence the construction and destruction
   /// order of the global timer lists.
@@ -221,7 +224,6 @@ class TimerGroup {
   void printJSONValue(raw_ostream &OS, const PrintRecord &R,
                       const char *suffix, double Value);
   const char *printJSONValues(raw_ostream &OS, const char *delim);
-  static const char *printAllJSONValues(raw_ostream &OS, const char *delim);
 };
 
 } // end namespace llvm