[DWARF] Support for DW_FORM_strx3 and complete support for DW_FORM_strx{1,2,4}

(consumer).

Reviewer: aprantl

Differential Revision:  https://reviews.llvm.org/D34418

llvm-svn: 305944

llvm/lib/Support/DataExtractor.cpp

@@ -68,6 +68,13 @@ uint16_t *DataExtractor::getU16(uint32_t *offset_ptr, uint16_t *dst,
                         Data.data());
 }
 
+uint32_t DataExtractor::getU24(uint32_t *offset_ptr) const {
+  uint24_t ExtractedVal =
+      getU<uint24_t>(offset_ptr, this, IsLittleEndian, Data.data());
+  // The 3 bytes are in the correct byte order for the host.
+  return ExtractedVal.getAsUint32(sys::IsLittleEndianHost);
+}
+
 uint32_t DataExtractor::getU32(uint32_t *offset_ptr) const {
   return getU<uint32_t>(offset_ptr, this, IsLittleEndian, Data.data());
 }