supersize: Move [clone] from name -> flags & rewrite Cluster()

tools/binary_size/libsupersize/testdata/Archive.golden

Index: tools/binary_size/libsupersize/testdata/Archive.golden
diff --git a/tools/binary_size/libsupersize/testdata/Archive.golden b/tools/binary_size/libsupersize/testdata/Archive.golden
index 2615b2146cdc103aeaf50c2749b47e7567a67573..4fa292f91fc147b5f10a6c00acdc1134689b2ea0 100644
--- a/tools/binary_size/libsupersize/testdata/Archive.golden
+++ b/tools/binary_size/libsupersize/testdata/Archive.golden
@@ -24,10 +24,10 @@ Section t: has 100.0% of 35900712 bytes accounted for from 15 symbols. 0 bytes a
 .text@28f1c8(size_without_padding=20,padding=8,full_name=_GLOBAL__sub_I_SkDeviceProfile.cpp,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=,flags={startup})
 .text@28f1e0(size_without_padding=69120,padding=4,full_name=foo_bar,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=,flags={unlikely})
 .text@2a0000(size_without_padding=16,padding=32,full_name=blink::ContiguousContainerBase::shrinkToFit(),object_path=third_party/WebKit.a/PaintChunker.o,source_path=,flags={})
-.text@2a0010(size_without_padding=12,padding=0,full_name=blink::ContiguousContainerBase::shrinkToFit() [clone .part.1234] [clone .isra.2],object_path=third_party/WebKit.a/PaintChunker.o,source_path=,flags={})
+.text@2a0010(size_without_padding=12,padding=0,full_name=blink::ContiguousContainerBase::shrinkToFit(),object_path=third_party/WebKit.a/PaintChunker.o,source_path=,flags={clone})
 .text@2a0020(size_without_padding=24,padding=4,full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&),object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=,flags={})
 .text@2a1000(size_without_padding=0,padding=4040,full_name=** symbol gap 1,object_path=,source_path=,flags={})
-.text@2a1000(size_without_padding=94,padding=0,full_name=blink::PaintChunker::releasePaintChunks() [clone .part.1],object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=,flags={anon})
+.text@2a1000(size_without_padding=94,padding=0,full_name=blink::PaintChunker::releasePaintChunks(),object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=,flags={anon,clone})
 .text@24ca628(size_without_padding=0,padding=35821002,full_name=** symbol gap 2 (end of section),object_path=,source_path=,flags={})
 .rodata@266e600(size_without_padding=1961984,padding=0,full_name=** merge strings,object_path=,source_path=,flags={})
 .rodata@284d600(size_without_padding=3425,padding=0,full_name=** merge constants,object_path=,source_path=,flags={})