RFR: JDK-8313790: [arm32] Specify -marm when building without an ABI profile [v2]

[Thomas Stuefe]

> See [JDK-8288719](https://bugs.openjdk.org/browse/JDK-8288719) and subsequent [discussion](https://mail.openjdk.org/pipermail/build-dev/2022-May/034635.html) back in 2022.
> 
> On Arm, we can generate either arm- or thumb-code (`-marm` or `-mthumb`). 
> 
> At the moment, if we don't specify an ABI profile (`--with_abi_profile`) when configuring the build, we call gcc without `-marm` or `-mthumb`. Then we use whatever the toolchain defaults too, which is pretty much random (it depends on how the toolchain itself had been built). That can cause really rare but tricky problems when combining static assembly and C++ code (See e.g. JDK-8288719).
> 
> I propose to always specify `-marm` as default, unless an ABI profile is given, to prevent such errors.
> 
> Thanks to @marchof for testing this.

Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - Merge branch 'openjdk:master' into JDK-8313790-arm32-Specify-marm-when-building-without-an-ABI-profile
 - start

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15162/files
  - new: https://git.openjdk.org/jdk/pull/15162/files/c01809a7..94afa2f4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15162&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15162&range=00-01

  Stats: 26592 lines in 583 files changed: 13667 ins; 5224 del; 7701 mod
  Patch: https://git.openjdk.org/jdk/pull/15162.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15162/head:pull/15162

PR: https://git.openjdk.org/jdk/pull/15162