[llvm-bugs] [Bug 36926] New: Add a flag to disable emitting the custom event instrumentation points

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36926

            Bug ID: 36926
           Summary: Add a flag to disable emitting the custom event
                    instrumentation points
           Product: XRay
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Clang
          Assignee: dberris at google.com
          Reporter: dberris at google.com
                CC: llvm-bugs at lists.llvm.org

This allows us to control whether or not we want to emit the custom event
instrumentation points. We want this for the following reasons:

- The instrumentation points are not supported in all platforms yet. We can set
the default for these flags differently for different targets/front-ends.
- The instrumentation points are currently expensive in terms of impact in code
size as well as runtime overheads.
- Provide more controls of the XRay instrumentation features we're providing at
compile-time to allow users to make trade-offs on which kinds of sleds should
be emitted (as we add more instrumentation point types in the future).

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