RFR: 6973: New Method Profiling Page for JMC

[Jean-Philippe Bempel]

Tabs for Predecessors and Successors instead of Packages/Classes

![JMC_MethodProfiling_Pred](https://user-images.githubusercontent.com/4610701/100017066-a1774200-2dda-11eb-80c1-9113478a307b.png)

![JMC_MethodProfiling_Suc](https://user-images.githubusercontent.com/4610701/100017088-aa681380-2dda-11eb-8374-f2e30c8d2b22.png)

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Commit messages:
 - 6973: New Method Profiling Page for JMC

Changes: https://git.openjdk.java.net/jmc/pull/165/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=165&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6973
  Stats: 442 lines in 4 files changed: 357 ins; 24 del; 61 mod
  Patch: https://git.openjdk.java.net/jmc/pull/165.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/165/head:pull/165

PR: https://git.openjdk.java.net/jmc/pull/165