[PATCH] [AArch64, ARM] Add v8.1a architecture and generic cpu

[Vladimir Sukharev]

It has been added already in backend - http://reviews.llvm.org/D8505 , where we got no other decent possibility.
Why not to use the same in frontend?
Also, see comments below


================
Comment at: lib/Basic/Targets.cpp:4197
@@ -4184,2 +4196,3 @@
         .Cases("cortex-a53", "cortex-a57", "cortex-a72", "8A")
+        .Case("generic-armv8.1-a","8_1A")
         .Default(nullptr);
----------------
for a57+v8.1a it would be weird to try to pass the test, commented below.
a57 would normally normally yield macro
```
__ARM_ARCH_8A__ 1
```
see https://github.com/llvm-mirror/clang/blob/1d941335617c6199e8340084c8a6c37c1b8014ec/lib/Basic/Targets.cpp#L4244

But I suspect we'd need to have
```
__ARM_ARCH_8_1A__ 1
```
, as tested in very last test here.
Unfortunately, without ACLE issued we could not yet realize, whether we'd need both of them.

================
Comment at: test/Preprocessor/arm-target-features.c:322
@@ +321,3 @@
+// CHECK-V81A: __ARM_ARCH 8
+// CHECK-V81A: __ARM_ARCH_8_1A__ 1
+// CHECK-V81A: #define __ARM_ARCH_PROFILE 'A'
----------------
for a57+v8.1a it would be weird to pass this test

http://reviews.llvm.org/D8493

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