Compute the size of the FDE encoding instead of hard coding it. Update

X8664_ELFTargetObjectFile::getFDEEncoding to match reality.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129959 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetAsmInfo.h

@@ -58,6 +58,10 @@ public:
     return TLOF->getEHFrameSection();
   }
 
+  const unsigned getFDEEncoding() const {
+    return TLOF->getFDEEncoding();
+  }
+
   unsigned getDwarfRARegNum(bool isEH) const {
     return TRI->getDwarfRegNum(TRI->getRARegister(), isEH);
   }