ACQUIRE_LOCK deadlock with ipe

When GHC is compiled with both profiling and ipe information, we try to acquire the eventlog mutex twice in the same thread.

ghc: internal error: ACQUIRE_LOCK(0x1dc2e7e0) failed (rts/eventlog/EventLog.c:1572): 35
    (GHC version 9.9.20231213 for x86_64_unknown_linux)
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug

GHC is compiled using --flavour=perf+profiled_ghc+no_dynamic_ghc+ipe+debug_ghc+debug_info

Then we run ghc with both heap profiling and eventlogs enabled: ghc +RTS -hb -l

The lock is initially acquired in postIPE:

void postIPE(const InfoProvEnt *ipe)
{
    ACQUIRE_LOCK(&eventBufMutex);

Then we attempt to acquire it again in flushAllCapsEventsBufs

void flushAllCapsEventsBufs(void)
{
    if (!event_log_writer) {
        return;
    }

    ACQUIRE_LOCK(&eventBufMutex);
    printAndClearEventBuf(&eventBuf);
    RELEASE_LOCK(&eventBufMutex);