change mangling to std::

Author: frasercrmck

libcxxabi/src/demangle/ItaniumDemangle.h

@@ -4335,7 +4335,7 @@ Node *AbstractManglingParser<Derived, Alloc>::parseType() {
     case 'F': {
       First += 2;
       if (consumeIf("16b"))
-        return make<NameType>("bfloat16_t");
+        return make<NameType>("std::bfloat16_t");
       Node *DimensionNumber = make<NameType>(parseNumber());
       if (!DimensionNumber)
         return nullptr;

libcxxabi/test/test_demangle.pass.cpp

@@ -30246,7 +30246,7 @@ const char* cases[][2] = {
     {"_Z1fDSDRl", "f(_Sat long _Fract)"},
     {"_Z1fDSDRm", "f(_Sat unsigned long _Fract)"},
 
-    {"_Z11bfloat16addDF16bDF16b", "bfloat16add(bfloat16_t, bfloat16_t)"},
+    {"_Z11bfloat16addDF16bDF16b", "bfloat16add(std::bfloat16_t, std::bfloat16_t)"},
     // clang-format on
 };
 

llvm/include/llvm/Demangle/ItaniumDemangle.h

@@ -4335,7 +4335,7 @@ Node *AbstractManglingParser<Derived, Alloc>::parseType() {
     case 'F': {
       First += 2;
       if (consumeIf("16b"))
-        return make<NameType>("bfloat16_t");
+        return make<NameType>("std::bfloat16_t");
       Node *DimensionNumber = make<NameType>(parseNumber());
       if (!DimensionNumber)
         return nullptr;