DebugInfo: change the PDB UniqueId type to uint8_t

Since we type-erase the Windows GUID structure, use unsigned bytes
rather than char, which may be signed (-fsigned-char).  NFC

llvm-svn: 290765

llvm/include/llvm/DebugInfo/PDB/Raw/RawTypes.h

@@ -263,7 +263,7 @@ struct ModuleInfoHeader {
 /// is abstracted here for the purposes of non-Windows platforms that don't have
 /// the GUID structure defined.
 struct PDB_UniqueId {
-  char Guid[16];
+  uint8_t Guid[16];
 };
 
 // The header preceeding the global TPI stream.

llvm/tools/llvm-pdbdump/PdbYaml.cpp

@@ -57,7 +57,7 @@ template <> struct ScalarTraits<llvm::pdb::PDB_UniqueId> {
         Scalar[24] != '-')
       return "GUID sections are not properly delineated with dashes";
 
-    char *OutBuffer = S.Guid;
+    uint8_t *OutBuffer = S.Guid;
     for (auto Iter = Scalar.begin(); Iter != Scalar.end();) {
       if (*Iter == '-' || *Iter == '{' || *Iter == '}') {
         ++Iter;