[golang/go] runtime/libfuzzer: pcTables registered with zero PCs, breaking -print_pcs and -print_funcs

### ROOT CAUSE The issue arises because the `pcTables` in `runtime/libfuzzer.go` is initialized as a zero-filled byte slice. LibFuzzer expects this table to contain valid PC addresses and flags, but since it's zero-initialized, all entries are invalid, leading to the observed problem. ### CODE FIX To fix the issue, we need to correctly populate the `pcTables` with the appropriate PC addresses and flags before registering it with libFuzzer. Here's the modified code:

func init() {
	libfuzzerCallWithTwoByteBuffers(&__sanitizer_cov_8bit_counters_init, &__start___sancov_cntrs, &__stop___sancov_cntrs)
	
	// Calculate the size of the PC table based on the number of coverage points
	start := unsafe.Pointer(&__start___sancov_cntrs)
	end := unsafe.Pointer(&__stop___sancov_cntrs)
	size := (uintptr(end) - uintptr(start)) // Size in bytes for counters
	sizePC := 2 * unsafe.Sizeof(uintptr(0)) // Each PC entry is two pointers (PC and flags)
	
	// Create a buffer to hold the PC and flags
	pcTables := make([]byte, sizePC*2) // Adjust size based on actual coverage points

	// Populate pcTables with correct PC addresses and flags
	// (Assuming a function to generate these values exists)
	populatePCTables(pcTables)

	libfuzzerCallWithTwoByteBuffers(&__sanitizer_cov_pcs_init, &pcTables[0], &pcTables[len(pcTables)-1])
}


**Note:** Replace `populatePCTables` with the actual function that writes the correct PC addresses and flags into `pcTables` based on the coverage data.