DwarfDebug: Simplify. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271360 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 6195cae..51226fd 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -470,12 +470,8 @@ void DwarfDebug::beginModule() {
 
   const Module *M = MMI->getModule();
 
-  unsigned NumDebugCUs = 0;
-  for (DICompileUnit *CUNode : M->debug_compile_units()) {
-    (void)CUNode;
-    ++NumDebugCUs;
-  }
-
+  unsigned NumDebugCUs = std::distance(M->debug_compile_units_begin(),
+                                       M->debug_compile_units_end());
   // Tell MMI whether we have debug info.
   MMI->setDebugInfoAvailability(NumDebugCUs > 0);
   SingleCU = NumDebugCUs == 1;