[test/Transforms/InstCombine/shift.ll] Removed duplicate test cases. NFC.

Removed some duplicate test cases from the file /test/Transforms/InstCombine/shift.ll.

test54 and test57 were duplicates of each other.
test55 and test58 were duplicates of each other.

(Removed test57 and test58)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223767 91177308-0d34-0410-b5e6-96231b3b80d8
Removal Of Duplicate Test Cases and Addition Of Missing Check Statements


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223768 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Bring some sanity to the x86 CPU processor definitions.

Notably, this adds simple micro-architecture names for the Intel CPU
variants, and defines the old 'core'-based names as aliases. GCC has
started to simplify their documented interface to use these names as
well, so it seems like we can start to converge on a consistent pattern.

I'd appreciate Intel double checking the entries that aren't yet
documented widely, especially Atom (Bonnell and Silvermont), Knights
Landing, and Skylake. But this change shouldn't break any existing
users.

Also, ran clang-format to re-format this code and it actually worked
(modulo a tiny bug) so hopefully we can start to stop thinking about
formatting this stuff.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223769 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Add a test for the CPU names that should have been in r223769.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223770 91177308-0d34-0410-b5e6-96231b3b80d8