MCFragment: Refactor LEB

* Deduplicate creation of SLEB128/ULEB128 with makeLEB.
* Call newFragment to prepare for removing getOrCreateDataFragment.

Author: MaskRay

llvm/include/llvm/MC/MCSection.h

@@ -444,6 +444,12 @@ class MCFragment {
   }
 
   //== FT_LEB functions
+  void makeLEB(bool IsSigned, const MCExpr *Value) {
+    assert(Kind == FT_Data);
+    Kind = MCFragment::FT_LEB;
+    u.leb.IsSigned = IsSigned;
+    u.leb.Value = Value;
+  }
   const MCExpr &getLEBValue() const {
     assert(Kind == FT_LEB);
     return *u.leb.Value;
@@ -456,10 +462,6 @@ class MCFragment {
     assert(Kind == FT_LEB);
     return u.leb.IsSigned;
   }
-  void setLEBSigned(bool S) {
-    assert(Kind == FT_LEB);
-    u.leb.IsSigned = S;
-  }
 
   //== FT_DwarfFrame functions
   const MCExpr &getDwarfAddrDelta() const {

llvm/lib/MC/MCObjectStreamer.cpp

@@ -215,9 +215,8 @@ void MCObjectStreamer::emitULEB128Value(const MCExpr *Value) {
     return;
   }
   auto *F = getOrCreateDataFragment();
-  F->Kind = MCFragment::FT_LEB;
-  F->setLEBSigned(false);
-  F->setLEBValue(Value);
+  F->makeLEB(false, Value);
+  newFragment();
 }
 
 void MCObjectStreamer::emitSLEB128Value(const MCExpr *Value) {
@@ -227,9 +226,8 @@ void MCObjectStreamer::emitSLEB128Value(const MCExpr *Value) {
     return;
   }
   auto *F = getOrCreateDataFragment();
-  F->Kind = MCFragment::FT_LEB;
-  F->setLEBSigned(true);
-  F->setLEBValue(Value);
+  F->makeLEB(true, Value);
+  newFragment();
 }
 
 void MCObjectStreamer::emitWeakReference(MCSymbol *Alias,