[InstrProfiling] Fix warnings when building for Windows

The Headers.CountersDelta field is an uint64_t, not a pointer,
so just cast to uint32_t to truncate it.

Differential Revision: https://reviews.llvm.org/D107619

compiler-rt/lib/profile/InstrProfilingWriter.c

@@ -286,7 +286,7 @@ lprofWriteDataImpl(ProfDataWriter *Writer, const __llvm_profile_data *DataBegin,
   /* On WIN64, label differences are truncated 32-bit values. Truncate
    * CountersDelta to match. */
 #ifdef _WIN64
-  Header.CountersDelta = (void *)(uint32_t)Header.CountersDelta;
+  Header.CountersDelta = (uint32_t)Header.CountersDelta;
 #endif
 
   /* Write the profile header. */