memory read -f X doesn't print anything (lldb should warn when encountering an unsupported byte size)

Also add a test sequence for it.

rdar://problem/10876841

llvm-svn: 150766

lldb/source/Core/DataExtractor.cpp

@@ -1756,7 +1756,7 @@ DataExtractor::Dump (Stream *s,
                 s->Printf ("%s", float_cstr);
                 break;
             }
-            else if (sizeof(long double) * 2 == item_byte_size)
+            else
             {
                 s->Printf ("unsupported hex float byte size %u", item_byte_size);
                 return start_offset;

lldb/test/functionalities/memory/read/TestMemoryRead.py

@@ -85,6 +85,11 @@ class MemoryReadTestCase(TestBase):
         self.expect("memory read --format char[] --size 7 --count 1 `&my_string`",
             substrs = ['abcdefg'])
 
+        # (lldb) memory read --format 'hex float' --size 16 `&argc`
+        # 0x7fff5fbff9a0: unsupported hex float byte size 16
+        self.expect("memory read --format 'hex float' --size 16 `&argc`",
+            substrs = ['unsupported hex float byte size'])
+
 
 if __name__ == '__main__':
     import atexit