[MCAsmInfo] Delete unused doesSupportExceptionHandling

ExceptionHandling:: is a bit misleading - we actually use the term for both
exceptions and non-exception .eh_frame usage.

Author: MaskRay

llvm/include/llvm/MC/MCAsmInfo.h

@@ -636,10 +636,6 @@ class MCAsmInfo {
 
   bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
 
-  bool doesSupportExceptionHandling() const {
-    return ExceptionsType != ExceptionHandling::None;
-  }
-
   ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
   WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }