Record the DWARF version in MCContext

Record the DWARF version in MCContext, and use it when
emitting the dwarf version into the debug info.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207739 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCContext.h

@@ -147,6 +147,9 @@ namespace llvm {
     /// non-empty.
     StringRef DwarfDebugProducer;
 
+    /// The maximum version of dwarf that we should emit.
+    uint16_t DwarfVersion;
+
     /// Honor temporary labels, this is useful for debugging semantic
     /// differences between temporary and non-temporary labels (primarily on
     /// Darwin).
@@ -396,6 +399,9 @@ namespace llvm {
     void setDwarfDebugProducer(StringRef S) { DwarfDebugProducer = S; }
     StringRef getDwarfDebugProducer() { return DwarfDebugProducer; }
 
+    void setDwarfVersion(uint16_t v) { DwarfVersion = v; }
+    uint16_t getDwarfVersion() const { return DwarfVersion; }
+
     /// @}
 
     char *getSecureLogFile() { return SecureLogFile; }