NFC:  Rename MCSafeSEHFragment to MCSymbolIdFragment

Summary:
This fragment emits a symbol ID and will be useful for more than just Safe SEH
tables (e.g., I plan to re-use it for Control Flow Guard tables).  This is
simply a rename refactor.

Reviewers: rnk

Subscribers: llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D39770

llvm-svn: 317703
diff --git a/llvm/lib/MC/MCFragment.cpp b/llvm/lib/MC/MCFragment.cpp
index 94839de..1aed50a 100644
--- a/llvm/lib/MC/MCFragment.cpp
+++ b/llvm/lib/MC/MCFragment.cpp
@@ -281,8 +281,8 @@
     case FT_Padding:
       delete cast<MCPaddingFragment>(this);
       return;
-    case FT_SafeSEH:
-      delete cast<MCSafeSEHFragment>(this);
+    case FT_SymbolId:
+      delete cast<MCSymbolIdFragment>(this);
       return;
     case FT_CVInlineLines:
       delete cast<MCCVInlineLineTableFragment>(this);
@@ -326,7 +326,7 @@
   case MCFragment::FT_DwarfFrame: OS << "MCDwarfCallFrameFragment"; break;
   case MCFragment::FT_LEB:   OS << "MCLEBFragment"; break;
   case MCFragment::FT_Padding: OS << "MCPaddingFragment"; break;
-  case MCFragment::FT_SafeSEH:    OS << "MCSafeSEHFragment"; break;
+  case MCFragment::FT_SymbolId:    OS << "MCSymbolIdFragment"; break;
   case MCFragment::FT_CVInlineLines: OS << "MCCVInlineLineTableFragment"; break;
   case MCFragment::FT_CVDefRange: OS << "MCCVDefRangeTableFragment"; break;
   case MCFragment::FT_Dummy: OS << "MCDummyFragment"; break;
@@ -436,8 +436,8 @@
     OS << "\n       ";
     break;
   }
-  case MCFragment::FT_SafeSEH: {
-    const MCSafeSEHFragment *F = cast<MCSafeSEHFragment>(this);
+  case MCFragment::FT_SymbolId: {
+    const MCSymbolIdFragment *F = cast<MCSymbolIdFragment>(this);
     OS << "\n       ";
     OS << " Sym:" << F->getSymbol();
     break;