[NFC][DwarfLowLevel] Make getRelocatedValueImpl public (#160618)

Without this, the class is useless.

Author: Sterling-Augustine

llvm/include/llvm/DebugInfo/DWARF/LowLevel/DWARFDataExtractorSimple.h

@@ -179,6 +179,7 @@ class DWARFDataExtractorBase : public DataExtractor {
 
 class DWARFDataExtractorSimple
     : public DWARFDataExtractorBase<DWARFDataExtractorSimple> {
+public:
   using DWARFDataExtractorBase::DWARFDataExtractorBase;
 
   LLVM_ABI uint64_t getRelocatedValueImpl(uint32_t Size, uint64_t *Off,