[MC] Add MCFragment allocation helpers

`allocFragment` might be changed to a placement new when the allocation
strategy changes.

`allocInitialFragment` is to deduplicate the following pattern
```
  auto *F = new MCDataFragment();
  Result->addFragment(*F);
  F->setParent(Result);
```

Pull Request: https://github.com/llvm/llvm-project/pull/95197

1 files changed, 8 insertions, 8 deletions

diff --git a/llvm/lib/MC/MCCodeView.cpp b/llvm/lib/MC/MCCodeView.cpp
index d234ce1..713ae07 100644
--- a/llvm/lib/MC/MCCodeView.cpp
+++ b/llvm/lib/MC/MCCodeView.cpp
@@ -26,8 +26,6 @@
 using namespace llvm;
 using namespace llvm::codeview;
 
-CodeViewContext::CodeViewContext() = default;
-
 CodeViewContext::~CodeViewContext() {
   // If someone inserted strings into the string table but never actually
   // emitted them somewhere, clean up the fragment.
@@ -138,7 +136,7 @@ void CodeViewContext::recordCVLoc(MCContext &Ctx, const MCSymbol *Label,
 
 MCDataFragment *CodeViewContext::getStringTableFragment() {
   if (!StrTabFragment) {
-    StrTabFragment = new MCDataFragment();
+    StrTabFragment = MCCtx->allocFragment<MCDataFragment>();
     // Start a new string table out with a null byte.
     StrTabFragment->getContents().push_back('\0');
   }
@@ -450,9 +448,9 @@ void CodeViewContext::emitInlineLineTableForFunction(MCObjectStreamer &OS,
                                                      const MCSymbol *FnEndSym) {
   // Create and insert a fragment into the current section that will be encoded
   // later.
-  new MCCVInlineLineTableFragment(PrimaryFunctionId, SourceFileId,
-                                  SourceLineNum, FnStartSym, FnEndSym,
-                                  OS.getCurrentSectionOnly());
+  auto *F = MCCtx->allocFragment<MCCVInlineLineTableFragment>(
+      PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
+  OS.insert(F);
 }
 
 MCFragment *CodeViewContext::emitDefRange(
@@ -461,8 +459,10 @@ MCFragment *CodeViewContext::emitDefRange(
     StringRef FixedSizePortion) {
   // Create and insert a fragment into the current section that will be encoded
   // later.
-  return new MCCVDefRangeFragment(Ranges, FixedSizePortion,
-                           OS.getCurrentSectionOnly());
+  auto *F =
+      MCCtx->allocFragment<MCCVDefRangeFragment>(Ranges, FixedSizePortion);
+  OS.insert(F);
+  return F;
 }
 
 static unsigned computeLabelDiff(MCAsmLayout &Layout, const MCSymbol *Begin,