[edk2-devel] [RFC] Move CompilerIntrinsicsLib and ArmSoftFloatLib to MdePkg

["Oliver Smith-Denny" <osde@linux.microsoft.com>]

CompilerIntrinsicsLib and ArmSoftFloatLib add ARM/AARCH64 compiler
intrinsics and floating point functions required by OpenSSL,
respectively. CompilerIntrinsicsLib is used almost in every DSC that
builds ARM/AARCH64 and ArmSoftFloatLib is used by every DSC that builds
logic from OpenSSL. Together these make almost every DSC have a
dependency on ArmPkg, which is odd and for a handful, MdeModulePkg,
EmbeddedPkg, and ShellPkg, namely, it is a circular dependency.

There have been previous mailing list suggestions to move
CompilerIntrinsicsLib to MdePkg (possibly combining with other arch
intrinsics). I am not sure the end status of those conversations. By
moving these two libraries to MdePkg package, we accomplish a few
things:

   - Removing the circular dependency from MdeModulePkg and ShellPkg
     (EmbeddedPkg has other ArmPkg dependencies)

   - Aligning MdePkg as the base package where baseline build and spec
     dependencies are found with other industry standard behavior

   - Detangling ArmPkg and making ARM/AARCH64 more of a first class
     citizen in edk2 instead of bolted onto the side

There is no functional change here and the amount of work is light, but
I think it moves edk2 in the direction it wants to go, so I'm happy to
put up a PR for this, but I wanted to get feedback before I did so. This
aligns with similar efforts, such as moving more ARM/AARCH64 chipset
definitions to MdePkg from ArmPkg [1][2][3]. This also aligns to the
overall goal of deleting ArmPkg:
https://bugzilla.tianocore.org/show_bug.cgi?id=4121

Thanks,
Oliver

[1] 
https://github.com/tianocore/edk2/commit/f2b9d5417dccf763bcbb68cd0effed0e25890aab
[2] 
https://github.com/tianocore/edk2/commit/cf323e2839ce260fde43487baae205527dee1b2f
[3] 
https://github.com/tianocore/edk2/commit/c68fb69dfefa7a76ebad33674a49632c4f8c6926


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