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

[Magnus Ihse Bursie]

On Tue, 3 Nov 2020 22:36:34 GMT, John Paul Adrian Glaubitz <glaubitz at openjdk.org> wrote:

>> 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.
>
> Why do we disable the warning instead of fixing the incorrect indentations?

@glaubitz Good question. :) If you want to start fixing code to get rid of disabled warnings, I will not stand in your way!

For example, in hotspot and gcc, we have `parentheses comment unknown-pragmas address delete-non-virtual-dtor char-subscripts array-bounds int-in-bool-context ignored-qualifiers missing-field-initializers implicit-fallthrough empty-body strict-overflow sequence-point maybe-uninitialized misleading-indentation cast-function-type shift-negative-value`. I believe many of these should be fixed and removed from the list of disabled warnings.

But this bug is about disabling a warning in one compiler that we have already decided to disable in another.

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