AsmPrinter: Cleanup DIEValue::EmitValue() API, NFC

Stop taking a `dwarf::Form` in `DIEValue::EmitValue()` and
`DIEValue::SizeOf()`, since they're always passed `DIEValue::getForm()`
anyway.  This is just left over from when `DIEValue` didn't know its own
form.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240566 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfFile.cpp

@@ -103,7 +103,7 @@ unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
   // Size the DIE attribute values.
   for (const auto &V : Die.values())
     // Size attribute value.
-    Offset += V.SizeOf(Asm, V.getForm());
+    Offset += V.SizeOf(Asm);
 
   // Size the DIE children if any.
   if (Die.hasChildren()) {