Changes

[lldb/SWIG] Fix capitalization for case sensitive file systems.
When moving the Python directory I renamed it to python (lowercase) but 
didn't update the python.swig file.

[Clang] Handle target-specific builtins returning aggregates.
Summary: A few of the ARM MVE builtins directly return a structure type.
This causes an assertion failure at code-gen time if you try to assign
the result of the builtin to a variable, because the `RValue` created in
`EmitBuiltinExpr` from the `llvm::Value` produced by codegen is always 
made by `RValue::get()`, which creates a non-aggregate `RValue` that 
will fail an assertion when `AggExprEmitter::withReturnValueSlot` calls
`Src.getAggregatePointer()`. A similar failure occurs if you try to use 
the struct return value directly to extract one field, e.g.
`vld2q(address).val[0]`.
The existing code-gen tests for those MVE builtins pass the returned 
structure type directly to the C `return` statement, which apparently 
managed to avoid that particular code path, so we didn't notice the 
crash.
Now `EmitBuiltinExpr` checks the evaluation kind of the builtin's return 
value, and does the necessary handling for aggregate returns. I've added 
two extra test cases, both of which crashed before this change.
Reviewers: dmgreen, rjmccall
Reviewed By: rjmccall
Subscribers: kristof.beyls, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D72271

[Support][NFC] Add a comment about the semantics of MF_HUGE_HINT flag

[NFC,format] Sort switch cases alphabetically
This patch brings the switch cases of `llvm/lib/Support/Triple.cpp` back
into alphabetical order. This was noted during the the review of 
https://reviews.llvm.org/D69103
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D72452

[Support][NFC] Make some helper functions "static" in Memory.inc