supersize: Add symbol.template_name, and strip <>s from symbol.name

tools/binary_size/libsupersize/testdata/Archive_Elf.golden

Index: tools/binary_size/libsupersize/testdata/Archive_Elf.golden
diff --git a/tools/binary_size/libsupersize/testdata/Archive_Elf.golden b/tools/binary_size/libsupersize/testdata/Archive_Elf.golden
index 94ece31db403f876a6c25953997be05b2c09802b..0faa42d212e8f980635e6fac9c4b3d849d98ed52 100644
--- a/tools/binary_size/libsupersize/testdata/Archive_Elf.golden
+++ b/tools/binary_size/libsupersize/testdata/Archive_Elf.golden
@@ -7,18 +7,18 @@ gn_args=var1=true var2="foo"
 map_file_name=../test.map
 Section r: has 100.0% of 5927652 bytes accounted for from 9 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 11 bytes (0.0%)
-* 4 placeholders (symbols that start with **) account for 5927509.0 bytes (100.0%)
+* 4 placeholders (symbols that start with **) account for 5927509 bytes (100.0%)
 * 0 symbols have shared ownership
 Section b: has 40.3% of 524520 bytes accounted for from 6 symbols. 775936 bytes are unaccounted for.
 * Padding accounts for 196 bytes (0.0%)
 * 0 symbols have shared ownership
 Section d: has 100.0% of 1957016 bytes accounted for from 15 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 16 bytes (0.0%)
-* 2 placeholders (symbols that start with **) account for 1166732.0 bytes (59.6%)
+* 2 placeholders (symbols that start with **) account for 1166732 bytes (59.6%)
 * 0 symbols have shared ownership
 Section t: has 100.0% of 35900712 bytes accounted for from 18 symbols. 0 bytes are unaccounted for.
 * Padding accounts for 48 bytes (0.0%)
-* 3 placeholders (symbols that start with **) account for 35830760.0 bytes (99.8%)
+* 3 placeholders (symbols that start with **) account for 35830760 bytes (99.8%)
 * Contains 5 aliases, mapped to 2 unique addresses (60 bytes)
 * 1 symbols have shared ownership (12 bytes)
 .text@28d900(size_without_padding=16,padding=0,name=_GLOBAL__sub_I_page_allocator.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})