Allow DWARFFormValue::extractValue to be called with a null CU.

Currently FormValues are only used for attributes of DIEs and thus
uers always have a CU lying around when calling into the FormValue
API.
Accelerator tables encode their information using the same Forms
as the attributes, thus it is natural to use DWARFFormValue to
extract/dump them. There is no CU in that case though. Allow the
API to be called with a null CU arguemnt by making the RelocMap
lookup conditional on the CU pointer validity. And document this
new behvior in the header. (Test coverage for this use of the API
comes in the DwarfAccelTable support patch)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221835 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/DebugInfo/DWARFFormValue.h

@@ -57,6 +57,13 @@ public:
   bool isFormClass(FormClass FC) const;
 
   void dump(raw_ostream &OS, const DWARFUnit *U) const;
+
+  /// \brief extracts a value in data at offset *offset_ptr.
+  ///
+  /// The passed DWARFUnit is allowed to be nullptr, in which
+  /// case no relocation processing will be performed and some
+  /// kind of forms that depend on Unit information are disallowed.
+  /// \returns wether the extraction succeeded.
   bool extractValue(DataExtractor data, uint32_t *offset_ptr,
                     const DWARFUnit *u);
   bool isInlinedCStr() const {