[lldb] Don't call FixDataAddress when reading fp in ReadGPRValue (llvm#159606)

Based on testing on processors that use pointer metadata, and with all
the work done to delay calls to FixDataAddress, this is no longer
necessary.

Note that, with debugserver in particular, this is an NFC change: the
code path here is for frame zero, and debugserver will strip metadata
when reading fp from frame zero anyway.

(cherry picked from commit bce48c8)

Author: felipepiovezan

lldb/source/Target/RegisterContextUnwind.cpp

@@ -2204,9 +2204,6 @@ bool RegisterContextUnwind::ReadGPRValue(lldb::RegisterKind register_kind,
         if (generic_regnum == LLDB_REGNUM_GENERIC_PC ||
             generic_regnum == LLDB_REGNUM_GENERIC_RA)
           value = abi_sp->FixCodeAddress(value);
-        if (generic_regnum == LLDB_REGNUM_GENERIC_SP ||
-            generic_regnum == LLDB_REGNUM_GENERIC_FP)
-          value = abi_sp->FixDataAddress(value);
       }
       return true;
     }