RFR: 8253892: Disable misleading-indentation on clang as well as gcc

[Magnus Ihse Bursie]

With clang 10.0, the compiler now detects a new class of warnings. The `misleading-indentation` warning has previously been disabled on gcc for hotspot and libfdlibm.  Now we need to disable it for clang as well.

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Commit messages:
 - 8253892: Disable misleading-indentation on clang as well as gcc

Changes: https://git.openjdk.java.net/jdk/pull/1044/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1044&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253892
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1044.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1044/head:pull/1044

PR: https://git.openjdk.java.net/jdk/pull/1044