AArch64/ARM64: move ARM64 into AArch64's place

This commit starts with a "git mv ARM64 AArch64" and continues out
from there, renaming the C++ classes, intrinsics, and other
target-local objects for consistency.

"ARM64" test directories are also moved, and tests that began their
life in ARM64 use an arm64 triple, those from AArch64 use an aarch64
triple. Both should be equivalent though.

This finishes the AArch64 merge, and everyone should feel free to
continue committing as normal now.

llvm-svn: 209577
diff --git a/llvm/test/CodeGen/AArch64/callee-save.ll b/llvm/test/CodeGen/AArch64/callee-save.ll
index 9b04a8f9..046e6ce 100644
--- a/llvm/test/CodeGen/AArch64/callee-save.ll
+++ b/llvm/test/CodeGen/AArch64/callee-save.ll
@@ -1,19 +1,14 @@
-; RUN: llc -verify-machineinstrs -o - %s -mtriple=arm64-apple-ios7.0 | FileCheck %s --check-prefix=CHECK-ARM64
+; RUN: llc -verify-machineinstrs -o - %s -mtriple=arm64-apple-ios7.0 | FileCheck %s
 
 @var = global float 0.0
 
 define void @foo() {
 ; CHECK-LABEL: foo:
 
-; CHECK: stp d14, d15, [sp
-; CHECK: stp d12, d13, [sp
-; CHECK: stp d10, d11, [sp
-; CHECK: stp d8, d9, [sp
-
-; CHECK-ARM64: stp d15, d14, [sp
-; CHECK-ARM64: stp d13, d12, [sp
-; CHECK-ARM64: stp d11, d10, [sp
-; CHECK-ARM64: stp d9, d8, [sp
+; CHECK: stp d15, d14, [sp
+; CHECK: stp d13, d12, [sp
+; CHECK: stp d11, d10, [sp
+; CHECK: stp d9, d8, [sp
 
   ; Create lots of live variables to exhaust the supply of
   ; caller-saved registers
@@ -83,14 +78,9 @@
   store volatile float %val31, float* @var
   store volatile float %val32, float* @var
 
-; CHECK: ldp     d8, d9, [sp
-; CHECK: ldp     d10, d11, [sp
-; CHECK: ldp     d12, d13, [sp
-; CHECK: ldp     d14, d15, [sp
-
-; CHECK-ARM64: ldp     d9, d8, [sp
-; CHECK-ARM64: ldp     d11, d10, [sp
-; CHECK-ARM64: ldp     d13, d12, [sp
-; CHECK-ARM64: ldp     d15, d14, [sp
+; CHECK: ldp     d9, d8, [sp
+; CHECK: ldp     d11, d10, [sp
+; CHECK: ldp     d13, d12, [sp
+; CHECK: ldp     d15, d14, [sp
   ret void
 }