RFR: 8298736: Revisit usages of log10 in compiler code

[Damon Fenacci]

The use of the Math library `log10` function causes an overloading ambiguity error on SPARC when using it with integer typed parameters.

* adding a `static_cast<double>` to the parameter
* using the lib `log10` function (with `static_cast`s) instead of a custom one in `src/hotspot/share/opto/node.cpp`

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Commit messages:
 - JDK-8298736: Revisit usages of log10 in compiler code

Changes: https://git.openjdk.org/jdk/pull/11686/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11686&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298736
  Stats: 14 lines in 2 files changed: 0 ins; 11 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11686.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11686/head:pull/11686

PR: https://git.openjdk.org/jdk/pull/11686