[ProfileData] Use default member initialization (NFC) (#94860)

Identified with modernize-use-default-member-init.

Author: kazutakahirata

llvm/include/llvm/ProfileData/InstrProfReader.h

@@ -708,7 +708,7 @@ class IndexedInstrProfReader : public InstrProfReader {
   const uint8_t *BinaryIdsStart = nullptr;
 
   // Index to the current record in the record array.
-  unsigned RecordIndex;
+  unsigned RecordIndex = 0;
 
   // Read the profile summary. Return a pointer pointing to one byte past the
   // end of the summary data if it exists or the input \c Cur.
@@ -721,7 +721,7 @@ class IndexedInstrProfReader : public InstrProfReader {
       std::unique_ptr<MemoryBuffer> DataBuffer,
       std::unique_ptr<MemoryBuffer> RemappingBuffer = nullptr)
       : DataBuffer(std::move(DataBuffer)),
-        RemappingBuffer(std::move(RemappingBuffer)), RecordIndex(0) {}
+        RemappingBuffer(std::move(RemappingBuffer)) {}
   IndexedInstrProfReader(const IndexedInstrProfReader &) = delete;
   IndexedInstrProfReader &operator=(const IndexedInstrProfReader &) = delete;
 

llvm/include/llvm/ProfileData/SampleProfWriter.h

@@ -169,7 +169,7 @@ class SampleProfileWriterText : public SampleProfileWriter {
 
 protected:
   SampleProfileWriterText(std::unique_ptr<raw_ostream> &OS)
-      : SampleProfileWriter(OS), Indent(0) {}
+      : SampleProfileWriter(OS) {}
 
   std::error_code writeHeader(const SampleProfileMap &ProfileMap) override {
     LineCount = 0;
@@ -180,7 +180,7 @@ class SampleProfileWriterText : public SampleProfileWriter {
   /// Indent level to use when writing.
   ///
   /// This is used when printing inlined callees.
-  unsigned Indent;
+  unsigned Indent = 0;
 
   friend ErrorOr<std::unique_ptr<SampleProfileWriter>>
   SampleProfileWriter::create(std::unique_ptr<raw_ostream> &OS,