[JITLink][aarch64] Update aarch64 test names

Tests in test/ExecutionEngine/JITLink/AArch64 are for aarch64 only, so we don't
need to repeat 'aarch64' / 'arm64' in the individual test names.

Commit 8ad75c1 made a similar change for the x86-64 tests.

Author: lhames

llvm/test/ExecutionEngine/JITLink/AArch64/ELF_aarch64_ehframe.s renamed to llvm/test/ExecutionEngine/JITLink/AArch64/ELF_ehframe.s

@@ -1,6 +1,7 @@
 # RUN: rm -rf %t && mkdir -p %t
-# RUN: llvm-mc -triple=aarch64-unknown-linux-gnu -relax-relocations=false -position-independent -filetype=obj -o %t/aarch64_reloc.o %s
-# RUN: llvm-jitlink -noexec %t/aarch64_reloc.o
+# RUN: llvm-mc -triple=aarch64-unknown-linux-gnu -relax-relocations=false \
+# RUN:   -position-independent -filetype=obj -o %t/elf_minimal.o %s
+# RUN: llvm-jitlink -noexec %t/elf_minimal.o
 
 	.text
 	.globl	sub1

llvm/test/ExecutionEngine/JITLink/AArch64/ELF_aarch64_ehframe.test renamed to llvm/test/ExecutionEngine/JITLink/AArch64/ELF_ehframe.test

@@ -1,4 +1,4 @@
-# RUN: llvm-jitlink -noexec %S/Inputs/MachO_arm64_ehframe.o
+# RUN: llvm-jitlink -noexec %S/Inputs/MachO_ehframe.o
 #
 # Perform a no-exec link of MachO_arm64_ehframe.o and verify that it does not
 # generate any errors despite having a relocation on the pc-begin field.