[libcxxabi] Fix the long double demangling for PowerPC (#135332)
PowerPC uses a slightly different type of floats for their 128 bit long
doubles, as "double-double", with __LDBL_MANT_DIG__ == 106 rather than
__LDBL_MANT_DIG__ == 113 for IEEE 128 bit floats.
This fixes compiling libcxxabi for PowerPC after
3b70715c13876c51542ebfe2e3f4ee908f6785cb.
diff --git a/libcxxabi/src/demangle/ItaniumDemangle.h b/libcxxabi/src/demangle/ItaniumDemangle.h
index b9d1706..eca9dda 100644
--- a/libcxxabi/src/demangle/ItaniumDemangle.h
+++ b/libcxxabi/src/demangle/ItaniumDemangle.h
@@ -5741,7 +5741,7 @@
template <>
struct FloatData<long double>
{
-#if __LDBL_MANT_DIG__ == 113
+#if __LDBL_MANT_DIG__ == 113 || __LDBL_MANT_DIG__ == 106
static const size_t mangled_size = 32;
#elif __LDBL_MANT_DIG__ == 53 || defined(_MSC_VER)
// MSVC doesn't define __LDBL_MANT_DIG__, but it has long double equal to
