[FastISel][AArch64] Update function and variable names to follow the coding standard. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217845 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][AArch64] Allow handling of vectors during return lowering for little endian machines.

Allow handling of vectors during return lowering at least for little endian machines.
This was restricted in r208200 to fix it for big endian machines (according to
the comment), but it also disabled it for little endian too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217846 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][AArch64] Add missing test case for previous commit.

This adds the missing test case for the previous commit:
Allow handling of vectors during return lowering for little endian machines.

Sorry for the noise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217847 91177308-0d34-0410-b5e6-96231b3b80d8