add experimental comparison table

diff --git a/openpower/sv/comparison_table.mdwn b/openpower/sv/comparison_table.mdwn
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index 0000000..90041cb
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+# ISA Comparison Table
+
+| Name | Num of <br />opcodes | Scalable | Predicate <br /> Masks |
+|------|----------------------|----------|------------------------|
+| SVP64| 5 (plus prefixing)   | yes      | yes                    |