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Summary:
Previously the method would simply return false, causing every single
inline assembly constraint to trigger a compile error.
This adds inline assembly constraint support for the AVR target.
This patch is derived from the code in
AVRISelLowering::getConstraintType.
More details can be found on the AVR-GCC reference wiki
http://www.nongnu.org/avr-libc/user-manual/inline_asm.html
Reviewers: jroelofs, asl
Reviewed By: asl
Subscribers: asl, ahatanak, saaadhu, cfe-commits
Differential Revision: https://reviews.llvm.org/D28344
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294176 91177308-0d34-0410-b5e6-96231b3b80d8
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